Refusal to assist a client

On Saturday, 09/04/16, I received calls from my family members, saying that I've been sending call back messages, something I've never done. I loaded airtime, but within minutes it was depleted. I called my, supplier Cellc, a guy that assisted discovered that a lot more than that had occurred, there is someone else who is able to send messages & make calls without physical contact to my device. The subsequence of space & time at which the numerous messages were sent signified that whoever is committing this conduct is doing so ********ly. The consultant in a sense of urgency said that he has opened a case to investigate the matter, took my alternative contact details. He then advised me to get a new cellc sim card, which is not rica(d) & call cellc customer center for a sim swap meanwhile the investigation is being conducted. I did so as advised on the 11/04/16 around 13:45. I spoke to a lady by the Name of Nokubonga Mchunu. I explained to her what had transpired, she said; to do the sim swap she needs to know the last person I called, which was impossible as numerous calls were made beyond my control, she then rudely said she can't help me & cut the call as I was still talking.