Pathetic service from branch and call center

On the 28th of may i ordered pizza online for delivery at debonairs lorraine for 16.00 . When i got there at 16.05 i was told that the oven is broken. The branch did not even bother to phone and say that my order will be late or delayed. The manager was there and did not even bother to talk to me himself instead the front end staff had to talk to me. They eventually fixed the oven and when my order was done i was told that they do not have 2l coke which i ordered online as well and already paid for online. I phoned the call center to complain about the service and was told that someone will phone me within 24hours. Since then i have not received any phone calls from anyone and have received about 5 messages stating that they have tried contacting me and the case will be closed after another attempt within 24 hours but still did not receive a phone call. On 15 june i phoned the call center to find out what the deal is and i was told that they tried to contact me twice. The operator then told me that he will escalate the matter and that the branch will phone me within 24 to 48 hours. On 17 june i received a phone call from a debonairs table bay mall which is not in port elizabeth. I phoned again was told that the matter will be relayed to the branch i complained about and the branch manager will phone me today. Needless to say still no phone call and 4 messages 30 minutes apart stating that the case has been assigned. If this is how they handle complaints and treat customers then debonairs is a joke. This is pathetic customer service.