There seem to be some violations of law here -- the calls should stop between your request and the collection agency providing a written response.
Did you write to the credit reporting agencies and dispute the debt there? That may also help but only if there is an actual error on your report. If this is a debt you owe and it is accurately reported, do not dispute it.
You can contact a consumer attorney who specializes in this area of law in Houston by looking at National Association of Consumer Advocates website -- I recommend Dana Karni.
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Get a recorder and record all calls, document the times and who has called. Talk to a local attorney about a potential debt collection action.
I'm not your attorney; my answer includes assumptions. If you want me to be your attorney, I'm easy to find.
Order all 3 credit reports to see who is listed as a creditor that should include address and phone numbers. If you do not owe you should contact a Consumer lawyer to see if there are violations and if so to take action.
Sounds like you need to talk to an attorney about filing a chapter 13 bankruptcy. Also, whatever problem that is on your credit report is not going to be resolved quickly so you probably need another plan. Sometimes lenders will allow you to prove to them that the debt is not owed and being reported erroneously. I would reach out to family to see if you can find a co-signer. But as a very last resort consider a reversible mortgage, that is if you qualify.