Promise you someth and gives different things tha

I signed a contract for the S7 and thet said they are still waiting for the stock for the samsung chargers and now they come with a excuses that it was only limted stock but they said I will get a charger now I want to cancel my contract cause it is a breath of contract would never have signed if I knew this is going to happen now thay want to give me a diffrent make of charger not what I expected or was promised and I dont accept this