No receipt and no respect for my time

I went to Pedros on Wednesday to order a half chicken and chips meal. The lady serving me said she made a mistake and that she will bring me my order and DID NOT GIVE ME A SLIP. I then stood there as I watched other people getting served and getting their meals for more than 30 minutes. I then complained and they just said "it's coming" them pretending like we do not have jobs to get back to! They gave me my meal, still no receipt, no apology, nothing. I got back to work and my lunch time was over. Not cool