Staff playing with fire-slacking around

Bought food through KFC delivery (Sammy Marks-Pta) on the 9th online and it automatically paid from my bank account. Tracked the order and 30 minutes later the status was delivered whilst I was still waiting anxiously for the food. I ended up ordering again at Sasol steve biko, Wonderboom and again deducted from my bank account. Called customers service and they provided a voucher for the undelivered food. Today I placed an order for food at the Sasol branch to redeem the voucher and it did not work. Waited and 45 minutes into the ordeal and countless calls to head office (Thabiso) they (Seipati-team leader) could not figure out how the voucher system works and I'm still waiting for my food. I called customers services and told them to either give me my food and they will deal with their voucher internally coz my family was waiting for me. What ****ed me off is that staff (Musa-food packer, Thato-drinks packer and the female packer at chips station/drive through with no name tag) were joking about putting me on social media, luckily they did not have their phones on duty as I was going to sue for contravention of the POPI Act. Instead of getting my food ready they were enjoying mocking their paying customers waiting in vein instead of providing us food. I buy online meaning the food is paid for and each and every time I had to get collect my food I have to wait. I have been patient with these people at this branch but ever since the manager has been promoted and new people employed the service has gone down the drain. They should fire everyone that was on the night duty except Seipati coz she is the only one who gives a damn about customers.