Account blocked to update details

I have never encountered such bad service from a retail store!! They blocked my account in order to update my details, which haven't change since I opened the account. So I went to a store to buy something, got to the till and my card is being declined due to a block on the account. I was so embarrassed about all this, but I knew that my account is paid up to date and I only owe like R150. I actually pay my account early every month. I have never heard of a retail store blocking your account to update details. So when I called the call center to sort this out the lady told me that I have put the block on the account myself. By then I totally lost it. Never have I missed a payment or paid late and after all these years get service like this!!! I will tell everyone I know about this so people can see how Edgars treat their loyal customers!