Wrong Order,Missing Order,Bad Attitude

I've ordered from My Diners Gateway take away, I first Ordered a Chicken Tikka with Butter Naan and I got a Plain Naan instead, when I went home to eat it I found this out. The Butter Naan is a few Rands extra then the Plain Naan. The second time I went to the Restaurant, I ordered a Chicken Tikka with Butter Naan, they gave me a Mutton Curry with Butter Naan instead and I went home and ate the Mutton Curry, I had no choice, I was hungry and I couldn't take the food back to the restaurant because I live 30 minutes away, I would have to pay for fuel to go all the way back. So I phoned the Restaurant and spoke to the Manager in charge, he said I must come to the restaurant and he will sort me out. The next time I went back to the restaurant he said that I shouldn't have eaten the mutton curry and brought it back to the restaurant and he said that the butter naan is a small thing and left it as that. The next time my mum bought from that restaurant and she ordered and butter naan and they gave her a plain naan as well. Also The waiters at the restaurant have a really bad attitude, they don't smile and when you ask them questions they get angry.