Billing of expired contracts

I cancelled two contracts with Cell C on the 15th of May. One was already moved to a month to month contract and the other was to expire in June. I ordered the contract department to cancel the one immediately and the other as soon as it expires. <br> It is July now and I'm still being billed for both contracts. <br> I spoke again to the contract department which said: They will not reimburse me until they listen to the recording of our conversation on the 15th of Mei. The process will take a maximum of 2 days.<br> It has been 5 days and I have not heard a word.<br> Why should I take 30mins to phone them again to just hear the same excuse?<br> I am done with Cell C