Suspension of service

Once again, service suspended without any prior notification. My assumption is that I've reached my call limit. <br> <br> Cannot reach customer service. It just rings and cuts out after a few minutes (calling 808 from other MTN cellphone). As per previous incident, service cannot be unblocked at MTN shop, only by phoning customer service, who is not answering...<br> UNACCEPTABLE<br> With the previous incident I requested from customer service that the system sends me a sms notification prior to my service being suspended, in order for me to increase the call limit before being cut off. This failed as well. <br> <br> Please MTN, sort out your systems!!