CREDIT CARD PAYMENTS

In May 2015, After realising that I was not receiving monthly statements I activated my account online. To my horror I found payments to the amount of R25thousand made during March and April was not credited to my account. After endless emails and phone calls my account was finally credited.Thereafter I had to fight to have the interest incurred (none of myfault) reversed. Since then I emaied them the proof of payment each month .. 6 Oct I made a payment Of R10 00, emailed the proof as normal and even got a response confirming receipt thereof and also ensuring me that the payment will reflect within 2 - 3 days. To my horror to 16 Oct I checked my account online and found that no such payment has been credited to my account. Again the same issue. I called them spoke to the agent who was suppose to call me back. As I am in London I gave her my UK number. I am still waiting. I am now considering closing my card as this is a waste of precious productive time that no one should have to waste (including international call charges). DINERS CLUB SA AN INTERNATIONAL INSTITUTION??? DONT THINK SO!