RPM trying to collect on account for 2 people.. (LONG)

OK the company is RPM (reciveables Performance management)
My self and my roommate (a friend never a couple I am married and it is my husbands best friend) started getting calls from a place in VA last week. within minutes of each other. I hardly answer numbers I do not know so I wait and see iff they leave a voicemail and then call back. Well they didnt leave a message for either of us.
After a few days of them calling I finally said I am going to answer and see who this is (google didnt give me any info) and I finally speak to a guy there. He tells me oh.. you owe a bill to XXX Hospital. (I have never heard of) So I probe. I asked them for the date of service, adddress and phone number for the creditor etc. Well I got a whole bunch of account inf0-the $$, the supposed account number (i wrote it down) But the guy couldnt even tell me where the hospital was and he didnt have a phone number or address for the place. I am no dummy I said well I need proof cause I do not know of any hospital by that name near me.
The call ended. I called my friend and told him what happened and what they said etc. Well he decides he is going to answer when they call and they tell him oh you owe XX hospital (DIFF THEN Me by 1 letter-I was SE hospital he was NE hospital-aka north and south-neither anywhere in the state we live) and he probed also asked for more info about the creditor etc. once again-no information. they told him the amount but no account # or anything.
They called the net day, so we both answered-notebook in hand-wrote who we spoke to and the info they claimed they were calling about. same thing. $$ but no creditor info. we both requested the proof in writing.
Next day I got to looking up info on the company and found a phone number in a diff state and I called. spoke to a man, he too couldnt tell me the creditor ecept the name and $$ and kept asking how I was going to pay that. I asked for proof cause I thought he was lying and his info didnt match up. He tried to say I waas being rude and this was going to go on my credit etc. (i wasnt phased) call ended. My friend called back 20 minutes later to the same number I had found and i think got the same gentlemen. They said the same stuff-no info etc.. u owe this place etc.. and then they told him the same amount MY supposed debt was!!!! call ended.
It is not the following week and we BOTH got letters from this RPM company. Now here is the FUN part-BOTH OFOUR LETTERS CLAIM WE OWE THE SAME AMOUNT EXACTLY. ALSO the creditor on the letters is DIFFERENT then they told us-it is NOT any hospital is says: Pallinoso
That was it. account numbers were diff of course (and they didnt match anything the first guy had told me on the phone) They said Pallinoso was a debt buyer. and that is who they got the debt from. And that that company would NOT speak to us. I have looked and looked and found NOTHING on Pallinoso. I have found info on pallino asset management and under other Pallino names and one even referenced RPM. like maybe they are one and the same. Not sure though
My friend was told he owed like $1500 last week when they started calling. Now this letter says $533, which is the exact amount on MY bill. I have called the hospitals asking questions and about the bills, none match up to the $$ at all.
SOOOO... what do we do next-we think this place is trying to scam us. We have started noting when they call, who we speak to, account numbers etc as much as we can plus we have these 2 letters. The calls seemed to have died, but if this is indeed a scam of some sort what do we do?? HELP!!!
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