Incorrect information from staff caused card being blocked

I am HIGHLY upset and disappointed in Foshini. First of all, I have been a loyal customer to you all this time. I even paid during covid, even after losing my job. I skipped one month of payment because I really just could afford it at that point and when I could in October I spoke to a lady who gave me an amount of 710. I asked her if it would bring the account up to date and she assured me it would. I payed the 710 and I always only pay between the 10th and 20th of each month as that is when I get my money. Now I get an SMS saying I owe 1060 and the card is blocked. What the hell? I did pay the installment and arrears in October. The lady I spoke to now said oops sorry but that lady gave you the wrong information so yeah now you owe this much. Seriously??? How do you run your business??? Your people make mistakes and us as poor customers need to suffer the consequences?? This now goes on my credit record as a non-payment and gives me a bad rap as a customer because you guys can not get your facts straight. AND!!!! I checked my balance online two days ago. There clearly stated that the installment of 370 is due and that there was 370 credit available. How can that all change in 2 days??? I demand an explanation! The way I feel now, I will NEVER EVER buy from any of your branches ever again. And I will be more than happy to burn my card after my outstanding payments are paid. Your very quick to add additional costs for calling or sms'ing about payments but very bad at doing your jobs. This is truly pathetic.