Pathetic service British Airways

Terrible service from British airways i flew down to durban with them on the 20/03/2021 there was no ventilation on the flight, passengers were actually taking out their masks as they could not breathe, in this pandemic this should not be happening, I now had a return flight from King Shaka International to OR Tambo this morning the 05/04/2021, firstly I checked in online I was there at 05.45am that was the boarding time I had 2 bags one was a gym bag the other was a trolley bag I needed to check in the bag however the gates were already closed so they refused to take in the bag and they said I should look for a flight with a different airline and it would cost more, the attendant then called his supervisor Lydia for assistance she explained that they are unable to take the bag in I agreed and then according to her my hand luggage was over weight but it was just a normal sized gym planet fitness bag I pleaded with them to let me go on the flight as my mum would have fetched the big bag and taken it with her home also my funds were low I did not have the money to even pay for another flight, I asked the supervisor how come the other passengers are taking in trolley bags and this is just a gym bag she said I should not compare myself to other people and worry about them I should just worry about myself such poor customer service, anyways the difference i paid for another flight with them was R1900, which is a lot but atleast these staff should have some respect and concern for others maybe that will help, I hope the next person does not go through the same experience I have faced.