>So if xyz bank wrote off the loan...why should I be required to pay a company I never entered into an agreement with?

Because the collector bought the loan contract from the bank

An example clause in the credit card agreement:

>WE MAY SELL YOUR ACCOUNT We may at any time, and without notice to you, sell, assign or transfer your account, any amounts due on your account, this Agreement, or our rights or obligations under your account or this Agreement to any person or entity. The person or entity to whom we make any such sale, assignment or transfer shall be entitled to all of our rights and shall assume our obligations under this Agreement, to the extent sold, assigned or transferred.