MTN failure to reactivate International calling and lifting of non existent suspension

My contract line cant make international call since 17 December 2020 call Centre says they are no restrictions it must be network side .No one seems to be able to resolve this up to today 17 February 2021.Have 100s of references no resolution .Wrote to customer services, mtn complaints no response besides the auto response .Worst customer service ever they call centre supervisors keep promising to call back and never do .Worse when i call the call centre one holds on for a good 30mins minimum only to be told the same story since 17 December "please switch off your fone it should work because all your services are up and running from ourside" Doesnt MTN have technically competent personal to resolve such issues . On 10 February a new problem with my line apart from my 17 December international calling still not resolved to date, has developed i cant make any voice calls it says "YOURS SERVICES HAVE BEEN SUSPENDED PLEASE CALL YOUR SERVICE PROVIDER "Call centre says all my lines are open there is no suspension they dont understand why i am getting that message .Its seven days now with the same message and no one at MTN can resolve this Call centre says it must their network team which no one can speak to so i am stuck with a line thats not working yet am on contract Worst service poor customer services and care .Worse there on internal customer care channels or complain channels dont even respond .Where should one complain to get the service i am paying for ?ICSA?