Cell C harassment

I have been getting call from cell C about my alledged contract. I have told them several times (I stopped counting after the 15th phone call) that I do not have a contract with cell C. Their useless website does not permit me to contact them by e-mail since you need a cell c number (which I do not have) to send an e-mail.

In an attempt to fix the problem I visited Cape Gate branch where I was told that there is not contract between me and cell C on record.

One of two things need to happen: a.) Cell C needs to stop harassing me, or b.) Someone that is not a call centre agent must call me so that whatever their problem is can be sorted out.

I will not call them on my account so that they can sort out their problems.

If this is how cell C treats someone that is not their client, I shudder to think how they'll treat some that is contractually bound to them.