No Help

For the last few days people from all over even over sea has phone me to say that they have received a miss call from me. These call have not been made from my phone. I have phoned the Telkom Call centre to find out these call come from as i am receiving up too 20 calls a day. The call centre put me on hold for 17 min today and the problem is still there. Some one is using my number to make calls. Are they *****ing date or air time some were. Telkom PLEASE HELP to find out were this come from