No response and no resolution

I called in April to cancel my contract (which ends in Aug). They would not give me any e-mail correspondence to confirm the cancellation. I phoned the retentions department to find out about the payout amount in order to cancel the contract asap. At that stage, issues occurred which prevented me from taking out a new contract so I contacted them to advise that I would not be cancelling the contract early but that I still wished to have it cancelled when the contract ended in Aug. Again I received no confirmation. Now my contract is due to end in a week so I phoned again to confirm cancellation and they said they could only cancel it a month from today's date. When I stated that the contract was only for 2 years and that they had been given notification several times in April, I was then told that no, it has to be exactly 30 days notice and that the prior notice given 4 months ago was not valid as it was not 30 days from end of contract! I then requested to pay the outstanding balance in order to cancel the contract immediately (as I was going to do 4 months ago). Now all of a sudden that's not possible?! I requested they e-mail a copy of terms and conditions but have not received!