British Airways Nightmare

I have a booking for Monday 7 February 2022 and needed to change my booking to an earlier flight. I called the BA call centre. They were unable to assist since I had hired a vehicle as well as part of the package. I was directed BA Holidays on the number ***. I made 4 calls. I waited for 15 mins on the first two calls and 32 mins on the third call...still no answer. I then proceeded to drive to King Shaka Airport(which is 40kms away from me). The consultants there were gave me the same explanation but tried to assist me further but were unsuccessful. I then drove back home and tried to call for the 4th...whilst typing this 17 mins had passed. Its an absolute nightmare to book a vehicle or accommodation with BA since they dont seem to have the resources to assist with changes to these bookings. I have spent 5 hours trying to get through to BA Holidays.