harrassing collectors

about a month ago, I got a phone call from a collection agency. My brother answered the phone and spoke with the rep. When the rep asked who he was speaking with, my brother responded with the same question. The rep answered with a Mr.x ...so my brother replyied with ok I am Mr Smith. The rep went on to discuss my acct with my brother....when I did get the phone, I immediatly asked the rep to tell me the purpose of the call, he asked me if I misunderstood something he said. I told him I didnt hear anything he said because that wasnt me on the phone a minute ago. I asked to speak with his supervisor, at first he said he didnt have one. I got the reps name. I asked again for a supervisor...he told me to wait. He came back about a minute later, muffling his voice, pretending to be his supervisor!!
He then hung up when I called him on it. I called back and eventually got what I believe was a supervisor. I explained the situation, was told there was nothing they can do about it. my word against the reps.
Well that leads us to today. I got a phone call this morning, and no message was left. when I called the number back, I found out that it is the same company that I mentioned above. I immediatley asked for a supervisor again. the rep asked why, I told her that this account was supposed to be stricken from my records due to info being devulged...she literally laughed in my ear, and hung up. I called back and spoke with a supervisor again, I was again told there was nothing he or his company can do.....