Who do I pay?

I had internet service through my local phone company. Last year due to financial difficulties I had to cancel it early, which cost me a $200 early disconnect fee. When I talked to the phone company I told them I couldn't pay it all at once, but would pay $20 a month over what my phone bill was to go toward this. They said that was not a problem.

Two weeks later I get a notice from Oxford Management saying the phone comapny turned it over. I did not dispute it, nor did I make any payment to this company. A couple months later I get a letter from West Asset Management. I wrote and told them that I could only pay so much a month and sent a payment. They accepted it and I have been making payments regurlary since to them without any problems.

Today I get a letter from Allied Interstate saying the original creditor turned me over for collections to them, it does not show any current creditor only original. I will be sending them a DV letter.

However, here is where I get confused at. When looking at my credit report this evening, on the one it shows West Asset and under remarks it says account information disputed by consumer. I did not disupte this account information. So should I continue making my payments to West Asset and not worry about Allied Interstate unless I hear from them after sending DV. I have all cancled checks and one money order receipt for the payments I have made up to this point.