Poor customer service

The branch in Protea Glen has an extremely poor customer service and lacking problem solving s****s. I bought triple decker and they deliberately forgot to attach competition voucher, I communicated with them regarding the matter and the manager told me that the voucher will get delivered to me but I haven't recieved it even today it is been weeks now. I communicated with them on Facebook, I was told that they will look into the matter and resolve it soon, it has not been resolved and I feel like a stupid now. I think they are taking these vouchers for themselves. The other thing is that they don't fill their triple decker with enough meat like other Debonairs branches, they don't serve up to their promise. I'm no longer going to support them again!!!