Service suspended

I have had my cellphone contract s with MTN for close to the last 20 years .My current contracts with MTN includes my cellphone,my wife's cellphone and the slowest capped 1gig internet contract.On Friday 22 May to my susprise I recived a sms that i have reached my call limit and my service has been suspended,what the hell are these people talking about,I have never had a limit on my phonecalls and to top it all off,my wife's phone and my internet was also suspended,what the hell are these people thinking,I tried phoning the call centre without any joy as they are on strike,not my problem,keep your staff happy MTN then we as the public,the people paying your salaries will not have these problems.My wife is on the road and need her cellphone,now she is unable to make calls,will MTN come to her rescue if she needs to make an urgent call but cant becaus some idiot blocked my complete servive due to some unknown limit.I am considering cancelling my contracts with MTN and moving over to another service provider,but then again with the poor level of service I have been getting from them that will also turn out to be a hassle.I'm very disapointed MTN,very disapointed!!!