Loosing points/cash back at Edgars.

This is not about Edgars. I love Edgars and buys every month at Edgars, but I would like to copy and paste what happen at Engen, my points/cash back. I would like to write a review on Engen Garage Algoa Park Port Elizabeth. Its Saturday night now, this happend on Thursday Morning. I waited until now to write the report to calm down and also see clear and make sure I report this for the right reason. Last Sunday Morning on 1st March 2020 I went to the petrol station I made the purchase of R200,00 petrol. I stay in Algoa Park so I always make use of that petrol station. I work in Uitenhage. And also make use of the points/cash back systems. Sometimes the Edgars U cash card or the Clicks cash Card. On Sunday Morning the system was off at the Engen Algoa Park. The petrol attendent said I must come back again to ensure I get my points. I have no issue with the petrol attendent, he was very helpful and very nice. Siyabonga was very nice and helpful. I want to praise him. My issue comes in when I went back on the Thursday. I went back for more petrol and also to claim my previous points and the new petrol points i'm doing for that day. That very nice petrol attendant was not there, again i have no issue with the nice man. But the one that helped me that day did not want to help me, said I may not get Sunday's points. He called another lady(petrol attendent) with an attitude. I did not like that, so obviously I also got an attitude back. Then she called the Supervisor with the attitude also did not want to help me and his words to be was "**** happens". Well my complaint is, why If the system is off at that Engen, why is it my fault that I must loose points/cash back. At the end of the day I receive a half of the cash back using the previous purchase code. My sister is a lawyer and I am a Primary School teacher. So I do have the knowledge of my rights. Even as a Primary School teacher we had law subjects. So I know my Bill of Rights. I also feel a Supervisor with the attitude "**** HAPPENS" is fully trained right or acts like a Supervisor. My question is what is going to be done to sort out this problem? Because I do not feel happy to loose again points/cash back if it happens again. That Supervisor must learn the right way because what will happen if the system is off again. Must I really request a supervisor with the attitude "**** happens" again. Is this how Engen train the SUPERVISOR?? What will Edgars do about this?