Very poor customer service, It's disgusting. I have been loyal to tempest yet I always find myself getting the same bad service and inconvinience

I have always preferred tempest for car rentals for their rates.In 2016 I did a month to month rental with them for about 5 months, and each month I had to go inside the branch to renew my contract since I was using a debit card. Until one month when I went to renew I was told that they won't be giving me back the car because my account is suspended. I had my kids in the car and luggage which made it hard for me to use public transport. It was on a Sunday and they told me that the lady (Bongiwe)that can sort this out for me will be back on Monday only.I didn't understand why because I have had to come and make payment at their branch every month.I took my kids and went to get a car at europcar. The following day I had to email my bank statements to prove that I have been making my payments.They then apologised for the inconvenience which was too late as the damage had been done. But being a loyal customer I carried on using tempest when I needed a rented car, which went fine. Until today when I got to the PE branch to find that I have been blocked again for the same reason. I arrived at 07:40 in order to get to my meeting on time. But I then had to wait for the lady (Bongiwe again) to get at the office at 08:00 which didn't happen at 8:00. Same that called and apologised to me last time. I had to explain and show them e-mail communication regarding this which I luckily still had. I don't understand how I have been able to rent after my previous experience if this was not resolved. I'm now late for my meeting and upset which I really don't need in my line of work. I don't understand how they keep on blocking me and then come back and simple apologise for a damage that has already been done.