Bad Service and no response

I'm not even in South Africa and MTN still doesn't cease to disappoint. They cancelled my telephone number without any warning. No e-mail or anything, even though I had about R100 airtime on it and have been using it sporadically to check my South African bank acc etc. It is set on sms roaming so clearly I am not in the country, but I'm keeping it open for a reason. Terrible service as always. I e-mailed them requesting they reinstate my number and have received no reply (for 2 weeks). All my SA accounts are linked to that number and I now cannot log into my bank account because of this. PATHETIC. Can anyone tell me what I should do to get my number back or just their attention because they clearly don't respond to you via their "contact us" channels.... MTN South Africa I will spread this on all of my social media sites and express my deep disappointment at the terrible service I am receiving as a customer.... Just because I am currently not in the country does not mean that you stop giving me good service or responding to my queries.