weltman,weinberg & reis co., l.p.a law frim collections cleveland , Ohio

I have recieved seveal calls from this company. Repeated calls about a det. that no longer exists now im recieving letters in the mail stating they will persue a judgment i have diputed this several time but keep recieving letters in the mail with a payment coupons. im shall be contacting the BBB, and anyone else that will will able to hopefully assist with this situation im belive it is a fishing scam to gather information. they have given me 30 to respond now i am unsure what to do ..if i do not reply in 30 days they say they will concider this a valid debt. but if i reply them what the harrasment will continue. i feel unsafe and cant even pick up my phone these people are crazy. Please is any one out there know what eles i can do to stop this please help.