BP Complaints

Regarding the BP on Northline Rd. Southgate MI. (bp6896898)

when I put my BP gas Card in, the price came up same as cash but when it ask too use my.20 rewards it put the price at if I used a non BP cretit card. and did not give me my rewards. I did not notce it until after I filled my tank. When I went inside to tell them he said you have to say no twice. and then come in side and we will figher out. but there is no sign out there saying that and I use this card so I do not leave the side of my car. I could not stay for him to attempt to figure it out. So not once but twice I paid 10 cent more a gal. with my BP card. I have been a BP sent it as amico. I really feel that I was being taken advantage of and how many more people they did this to. I don't know how stupid they think we are, if one gas station can put in their computer and change the price, and if they can change the price on a blink of an eye,they can do it too. I hope you can let me know that this problem is corrected or may have to get a gas card from speedway. Isn't there a law for this. hope to here from you soon.
Nancy