settlement offer

If the settlement offer letter is duly signed by your creditor, then you can consider the settlement offer to be real. Before agreeing to the settlement offer, you should get it in writing from your creditor that he will provide you with "account satisfied" letter. If you pay as per the settlement offer, the account will be satisfied and the lender will forgive the rest of the balance amount.

If MCM sent you a letter with a settlement offer and you abide by it, your account will be satisfied in full even if they don't send you a PIF letter. Hang on to the settlement offer letter and maintain proof of your payments that meet the requirements of your offer. That's proof enough. If MCM or anyone else comes after you in the future, you will have a settlement offer letter and proof that you paid according to the terms of the settlement offer. That's all you'll need.