MRS BPO, L.L.C. Debt Collection Complaint

MRS BPO, L.L.C. Debt collection department,

Other (phone, health club, etc.) Cont'd attempts collect debt not owed Debt is not mine California

I had an issue with - Wireless. It got nasty; I wrote a letter to the -, sent a copy with a note to the President -. The result was that all the - billing was taken away, and I got a -+ credit on my Wireless account. I suddenly got a letter from MRS BPO, L.L.C. stating they were collecting - for -. No one at - knows anything about it. My current bills do not indicate the amount. I don't want my credit ruined by these people and no one knows who authorized the collection agency to come after me. -.