Rude office staff embarrassing customers.

I am disgust with my trip to your local garage in Margate. TotalEngergies Kingfisher garage as they have special which is not put on the system and once you pay the price is the old pricing and not discounted. I went to the garage and bought Maynards which was suppose to be on special but wasn't because I took one 60g and one 75g. I then asked the cashier to refund and give me the special and she went and got the rudest person. Even the other cashier saw how she treated me. So to ask for a refund is a problem. This woman is rude and should go dig a hole and sit in it. I will make sure everyone knows about your bad service and how you treat people.