Harrassment by DMC

I am being harassed by DMC at 6am in the mornings and then several times during the day. This is not right. I am sure the customer is protected against this abuse. The calls are endless and I am saying the same things to different people. And then they go on to discuss confidential issues with the person that answers the call. That is surely *******. The account you call about is prescribed and sold to DMC. I will not pay for this prescribed account. I have rights and will not be negotiating any deal with you or planning to pay you. I try to tell your call centre people this and they turn the story around. this debt is well over 7 YEARS OLD!!!!!! Whether I claim prescription or not - DMC IS NOT ALLOWED TO CALL OR COLLECT PRESCRIBED DEBT.