Totally cheating!!! Never rent from Budget ever again

I paid at EasyRentCars. I presented my voucher to the counter at Brisbane airport. First, the man up-sell me for a bigger car. I said no. I clearly remember I declined the Excess Reduction ('ER') insurance coverage at the counter. The man asked to me to sign on his little 6" screen. He didn't print me the contract as he said they're going paperless. However, I found my credit card is charged more than double of the car rent for this ER insurance. The email contract showed I accepted the ER insurance which I surely I didn't. I won't rent from Budget ever again.