NON-EXISTENT SERVICE

I've been a long-time customer and have had an account for decades with Mweb, being e-mail account and 3G broadband internet. Recently the 3G service stopped working. Only after I phoned their customer service was I told that the 3G service is no longer supp****/supported by them - NEVERMIND that I've been paying every month for this service and was NEVER contacted to be told, or any other service offered to me!! I was promised by the call-center that I would get a call back the same day (about a week ago now) and my service would be adjusted to an e-mail account service only, of course with the adjustment in fees as well. I've received no call. I've logged an online query on the Mweb website, and still no reply!! This is ridiculous, as I need to have my account downgraded, and it's just not happening!!! Gauging by this experience, I doubt whether I'll ever get a refund for the money I've paid - for NO 3G SERVICE at all!!!