Horrible customer service

I’m still not satisfied with Mondo I have been told that manager will return my call none of their managers phoned me on LY when I spoke to a consultant was told that me escalation it’s pending reason being Vanessa the consultant she’s doesn’t know and told me that my query will take 10 working days to be resolved. I explained to all those consultants that I’ve been speaking to who refused to call management that my line it’s been suspended and I’m working with my phone what’s even frustrating me more it’s I don’t owe Mondo a single cent instead Mondo owes me but yet the failing to refund me what they do is credit me with R22000. I’m really angry and annoyed cause now I can’t work I can’t do anything n yet month end I’m expected to pay the phone with MTN. Mondo mangers/consultants someone is not doing thier job I’ve written emails there’s no response to my emails I don’t know what to do now