Difficulty in cancelling service and unfair charge

I wanted to cancel my 4GB mobile data package with Afrihost because I wasn't going to be in the country for the month of September 2015. On 1st August 2015, I tried to do this in clientzone but I didn't find any option allowing me to do this so on the 2nd, I sent a mail to customer support. Customer support then told me that I didn't look properly and that I must go back to clientzone. I checked again and couldn't find this option. I sent another email saying that I checked again and then finally someone on their side decided to look and they found the option missing. I was told that this would be corrected and that my mobile package for September would be cancelled. On the 1st of September I received an invoice charging me for this service so I sent an email to accounts asking why. I got an email from Joyce saying that it was a mistake again and that I would get a refund. I have not received any communication from her regarding a refund so I sent an email to follow-up. Now Anita sends me an email saying that I was charged because my package was cancelled too late. I keep going in circles here. This is so frustrating! Afrihost, your staff is *********** and I want my refund!!!!!