Serving Hindu people beef saying its Lamb

I am shocked and disappointed at the blatant disregard for my religious beliefs, I went to the Burgerrack Bassonia . I am a Hindu who doesn't eat beef, I ordered the Spicy Lamb burger and asked the individual at taking the order about ten time if he is sure that he is giving me lamb burger, he assured me that its definitely lamb and it was bought from the same butcher where I buy my meat from, so I felt comfortable with that, also my food took 10 minutes longer to prepare . I then proceeded home and took out the burger and took a bite, and thought that this didn't taste like lamb. I then called the store again and he assured me that it was Lamb, i then called him again and he said that I can come back and check the packaging. I proceeded to head to the store and before I walked in the manager called me to ask if I am still on my way, i walked in and he then said that he is very sorry but it was in fact beef that he served me and he will make a lamb burger for me if I would like, he also showed me packaging that said lamb, but looked like he had stuffed a bit of beef mince into it, i asked for the owners number , he provided me with two numbers and I called both numbers about 3 times each, no answer, the manager called me back stating that the owner will call me back the next day which is today, never happened.

I am extremely upset at the fact that the owner didnt have the decency to call me, but more so at the SIN if serving people food that they are not allowed to eat because of religious reasons