Grubhub Ripped me off Internet

Grubhub is a RIPOFF! I was offered a 25% discount for my first order from a resturant. When i hit place my order on the app, i was billed the entire amount without the discount. I called *immediately* and asked to cancel the order. Grubhub told me it was too late and only offered me $10 off my next order. I was then told that, even though the discount was advertised on the grubhub app, the resturant has their own ordering service and i should have ordered there, and not on grubhub, to receive the discount. As this makes absolutely no sense, i asked to speak to a supervisor. I was placed on hold for a half hour and told i would get a callback in 24 hours, which i have not. I disputed the charge with my card company, filed a complaint with the BBB, and am contacting the AG. want everyone to know the shady practices of this company. They rip off hard working restaurant owners, drivers, and consumers, while offering a sub par app with horrible customer service. Lets get this rip off company put out of business.