Cell C gives personal details to another customer

When I purchased a 3G ****le at Cell C Cavendish, I was smsed the incorrect phone number and password by Cell C.(I still have this SMS) So when I recharged my account with 3G data, I never received the credit. I then Called the help line who told me that was not my number. I went into the Cavendish store again and dealt with Marwaan (assistant manager). He then checked the number that I had sent the recharge voucher to and saw there was only the 3G data on there, so he did a 'sim swop' but did not RICA that new sim into my name. The new sim now worked for a couple days, and then stopped working. I went back to the store and spoke to Marwaan again. His colleague informed me that the day before, another customer with that phone number had come in to complain their 3G had disappeared from their account,so he simply reversed the 3G back onto his number. Marwaan then suspended that customers line hoping to force him back to the store. He said he would try get the other customer to purchase 3G onto my correct number. (which is ridiculous). CELL C THEN GAVE OUT MY PERSONAL DETAILS TO THE OTHER CUSTOMER, who called me furious, wanting to know how I could authorise his line to be suspended