Sim block

Vodacom have blocked my sim card service, after I called them they notified that there was a sim swop on my sim card, they dont know who the people were that they spoke to, they didnt ask for document just took the number. They asked me all kind of questions, when did I use my phone last, what was my last airtime amount etc, But they didnt ask the person that did the sim swop. If i go to a branch they going to charge me to fix the problem they caused. The call centre mention it will take 24 hours. Now they want an avadavat!!! They Vodacom themselves are busy with *****!! How do you do a sim swop with no details, and after I answered all your questions and you check on your system you still want me to go to a police station to get documents. YOUR SERVICE IS PATHETIC I NEED YOU TO HAVE MY SIM SORTED ASAP!!!!