Bad service

Ordered lunch online on the 10th Sept at 11:05 i never received my order. I called the client care number. I spoke to 3 different agents who all promised to call me back but never did. On 12 sept they sent me an INVALID voucher. I called them again and they said yhey will get back to me. Today is the 17th still they haven't reach out to me 😡😡😡😡