What do I do now?

I allowed the man that would not stop calling me to take 1,000 a month out of my account. He at the time said my outstanding debt that chowed as a charge off on my account could be reduced from $18,000 to $9,000. I just got a letter in the mail saying I owe $18,660 still and they had taken another 1,000 out. I tried to call all numbers listed on the letter and also the internet numbers and all numbers are didconnected?? I am worried the $5,000 I have paid has not been put toward any debt