Disgusting experience - my diners North beach

Last week Sunday I ordered 2 x chicken tikka as a take away, after coming back from pmb. We always buy from my diners North beach, but we sit in. We got the tikka went home and opened it. It has a slab of Masala which I removed and then started eating the chicken. The chicken was Dry and tasted funny. My wife also had the same. We had a bit and then stopped. There was something wrong. I said I'll call them in the morning and complain. Both my wife and I had upset tummies as If it was good poisoning. For 2 days. I sent a response on their website, no response. I then called and complained, one of the staff said the manager will call, 2 days later, nothing. This is disgusting how they operate