MRPMobile still running a Debit on my account!

I bought a tablet through MRPmobile. After I opened it and started it, the tablet started to malfunction, blue screen etc. And it took forever to open an app. <br> <br> So on the 28th of July I phoned customer care to complain and cancel the contract. I was informed to pay a cancellation fee and email proof of payment through to them. <br> <br> After 6 days someone phoned me and said they have not received the payment and I must double check the reference number etc. <br> -Strangely enough I have a delivery receipt... I mailed everything to them again. I phoned the customer care number and spoke to Shaun. He had to \confirm"everything and couldn't provide me with any feedback. Eventually he alleged that I had \""sent the mail wrong and that their mail is blocking it because of that\"" - honestly!!!??? It is their server that is blocking it - how do you send a mail \""wrong\"" <br> He also contradicted himself the whole time. I eventually asked the recording of all the conversations we had"