Rude agent from your head office

I received a call from one of the agents in (I assume) the contracts department at your Head Office and he told me that I have been prequalified for a contract with Cell C. He told me which device I qualified for and the contract itself. I told the gentleman that I was not interested in any contracts and he asked me what device I currently have and I told him. To this point I am not sure why he asked me about the device, he then asked me how much I spend on data every month and I informed him that I have a contract with Telkom of which I am paying R100 every month for 15gig. He told me that it cannot be true as he knows that Telkom has the deal for R149. I then asked him if he was insinuating that I am lying about a transaction that is going off MY account. He then became rude and had a very horrible attitude about it, disagreeing with me about MY payment to Telkom. He then rudely told me that he will not continue any further with our discussion.

My complaint is that you cannot have rude agents calling about your deals and then debating about what the competitor has offered you. He should have focused on the reason for his call and not have been concerned about a transaction that has nothing to do with him or Cell C.

I am not a Cell C customer but this service is really disgusting to say the least.