Rude manager at sasol makipela north in bloemfontein

It is with a heavy heart I'm writing this email. I bought two bottles of 9kg gas at sasol makipela north in bloemfontein on the 16th May 2023. The other gas was for my mother and the other for myself. I'm hardly home and therefore hardly use the heater, only in the evenings. Everytime I would switch the heater on the house would smell of gas and I concluded there was a leak. At first I thought my heater was at fault and I decided to eventually take the gas bottle to my moms place to test it on her heater as she has never complained of hers and I bought them same place same day. When I connected mine to her heater I found that it does the same thing and the problem is the bottle and not the heater. I then took it back to sasol garage it on the 31st May 2023 in the afternoon. The manager was already off duty and some of the staff members were making fun of me that the bottle is half full, something that I did acknowledge that it has been used but not more that 4 times as I believe it was leaking that is why is half full. The other employees advised me to return the following day on the 1st of June 2023 when the manager is on duty I then went back the morning of the 1st June 2023, I explained to the manager what had happened, I went to the garage with the bottle and my heater for him to test it. We switched it on together in his presence, and it was smelling. His words were "its supposed to smell in the beginning" he went on to switch it off. I told him its not only in the beginning he told me he's not the supplier and that cylinder is empty. I asked how is it possible that its empty when the heater just went on with 3 full bars. Yes I did admit that it has worked I did not deny that but fact is there is a leak. The manager went on to tell me he will take the bottle to the supplier for them to test it and if the supplier feels there's nothing wrong with it then theres nothing he can do. I was willing to even pay half price as it is half but it was his attitude for me and his employees that made fun of me. I'm not happy with the service and if I was lying like they imply why would I honestly waste my petrol to go there twice to take the cylinder back. He asked for the slip and I lost it but I showed him my bank transaction that I bought it there. Why if he does not believe me don't he watch the CCTV because I was there on the 16th May 2023 and bought two gas bottles.

I met the manager in the morning around 8:15 am. 3 hours later he calls to say the suppliee came in and too the gas bottle, they weighed it and checked it and found nothing wrong. I should come back he will give me an empty bottle to buy gaa somewhere else and that I should refund him R140 for the gas I used and the supplier will also give him R140. What I do not understand is that initially I paid R280 for the gas now I have have to refund him R140 how? Because he should refund me the R140 as I used half the gas. He refused and tolde to leave the garage and never come buy there ever again. When I requested my bottle back that was half he told me there's quarter gas in there and its already with the supplier I should take the empty one and leave his store and never come back.