Frustrated about my account wrong billing

My account was closed last month with a message that I haven't paid my account. Which I haven't skipped in the past 4years by the way. After two days I was told it was wrong and they will reactivate the account. Now it's end of the month and my account has been debited R955 instead of R436. What an inconvenience as I went to the garage trying to fill up my tank and my card gets declined because of this. It then took me another 30minutes to call call centre which tells me that it was a mistake but we can only refund after 41days. How the hell do you take my money and leave me with nothing and tell me that I will get my money after over a month???? I want my money now and I must be paid back for the time my service was suspended last month as well.