Bad client service.

I upgraded in March & requested that they give me a deal equivalent to the previous one, so they agreed, after two months when I made my normal monthly payments, they said I have outstanding balance. When I asked they said on the upgrade the amount was higher, but I had a discount for two months, thats why I was paying my normal fee... I could have never agreed to the amount I can't afford. Now I'm going to default as I don't afford to pay the extra money.