Paid up letter reversed??????!!!!!

Surely there must be a way to deal with this useless rude bunch. How big companies can still make use of them I cannot understand. Due to a previous review on Hello Peter requesting a paid up letter for a Mr Price account tgat was settled by debit order approx 3 years ago. I received a paid up letter which was reversed!? by them....cannot get my head around this move. A email was send to me stating that this Mr Price account is still outstanding! I then requested a full statement not from MBD but from Mr Price, I just got a laughable statement with MBD including calls etc which I never received. Ridiculous. Btw Im still waiting for my full statement from them. Now all off a sudden I get daily sms re this so called Mr Price account to settle the outstanding amount. I got a call yesterday 16 May wanting to get a acknowledging re the so called outstanding account. I told the *********** person that I got a paud up letter from MBD and he actually asked me to send it to him.....very funny.. .I must send MBD their paid up letter. That account has been settled approx 3 years ago but even if it wasn't then the account prescribed. This morning after another harassing sms I called and a very rude person decided that she doesn't like my attitude and told me that she does not want to speak to me and slammed the phone down. In the meantime I cannot get another Miladys/Mr Price account opened with a now reinstated good credit rating only reason is this amount showing on the system even after the paid up letter that I got. My only hope now is the ombudsman.