THIS SEEMS THE ONLY WAY TO GET RESPONSES FROM MTN

I went to the MTN corporate office at work to cancel my data bundles. they advised that they are no longer allowed to attend to this and I must call the 808 number. I called at least 20 times and it is impossible to get through to a consultant. I then emailed the service desk, customer care and business email addresses for MTN to sort out my packages. i have sent at least 5 emails and to date they have not sorted it out. all I want is to cancel my 2x2gig data bundles *** and ***) and to make my one contract which expires next week into a pay as you go number ***) as I have two contracts. they are not attending to it and there are time periods within which you need to cancel like one month before expiry. PLEASE CAN SOMEONE ASSIST!!!