What to do if I've been paying a debt collector for the last 2 years, however I've not received any debt validation letters or letters than even I owed debt?

Question Details: They calimed that they sent mail to me, which I never got. And then said I was being sued by my original creditor. I used to get receipts in the mail but they have since stopped. I also used to be able to call and talk to a representative who suddenly "doesn't work there anymore" yet still had a voice-mail? When I called today, couldn't pay this month, I was told I had to and was very alienated. What should I do? Should I request a validation of debt? I was very vulnerable when they first contacted me 2 years back and caught off guard; I have a disability.

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