Not honouring my contract

I am supposed to receive 100 mins, 200 MB and 100 sms per month on my contract. Because my minutes were 251 end of July, they only took my balance up to 300 min. This is being dishonest and *****ing from their customers. I pay my debit order every month and can use my minutes as and when I want. When Custome Care phoned me with regards to my complaint, the lady had bad attitude. It is time for these large companies to stop treating their clients like uneducated people. I have signed a contract with them and they need to honour it.