Harassed by Foschini telemarketers ***

I get between 5 to 10 calls per day from ***. A division of the foschini group. I have been a customer for 5 years and have never defaulted on my account. I have spent in excess of tens of thousands of Rands on their products. However now I am being harassed by their telemarketers. I have even block the number yet still they call. I have contacted the call centre 3 times to ask them to please opt me out and all 3 times they assured me that they would make sure I would receive no more calls. It is now 20:58 Pm and I have received 6 calls from them; I have blocked all. I am going to close my account and discontinue using the foschini group after this harassment. I am a trainee chartered accountant and I don't need to deal with this stress after a stressful day at work.