wrong billing

last month someone tried doing a simswap with my contract number ,i called vodacom they couldnt pickup anything thats how useless they are .i recieved my invoice of the 10th of dec an has an amount of 748 that has to be debited .i called customer service to ask why was i billed so much money ....according to the consultant i spoke to there was a new insurance added on my name which im not aware of i have two contracts with Vodacom one for cellphone and one for data i only have one insurance which i took out when i got my phone ......im not sure why was the other one added im really tired of complaining about you guys im going straight to ombudsman ....