Sub standard service

I have received sub par service. I was quoted R269 on 30 June for my upgrade. I authorized the upgrade that day. I am now paying R316 a month for my contract and I have been told by the customer service lady, Nomsa Sithole, that all contracts were increased on 1 July. How is this ethical? I was not told on 30 June that the contract upgrade would increase in price the day after I authorized. If I had known that then I would not have authorized that package. When I queried this with Nomsa, she hung up on me. How do you expect to retain customers with this sort of sub par service? Over and above that, I had to fight for the R1200 credit on my account that was brought over from glocell. Which I am now told is R900 even though money was taken off my account for the last invoice.