Disappointed loyal customer

They do not even deserve 1 star. I have been trying since the 10th of May to find out why they are not updating my payment status. I have spoke to 3 different call center staff been transferred to incorrect departments. There is never a manager or team leader available. My statement date for May was the 8th.payennt was done on the 6th.on the morning of the 10th I received an sms that line is suspended. I called 135 spoke to a consultant sent through the proof to customer care and retention. On the 22nd line was suspended again. I spoke to another consultant forwarded him proof of payment on the 23rd. Today been the 26th I receive another sms saying if payment not received line will be suspended. Call centre unable to assist. They can see that case with retention is opened since the 10th.... 16 days????? All I want to know is where the problem is? Have they changed their banking details and the bank had not been updated. Payments to this account over the last few years have been either via a bank atm or at a store. I need some one to respond to me urgently. Call center is of no help.