Useless TELKOM

Having problems with my call time minutes on my mobile account. I NEVER had issues until ± two months ago. When I want to make a call on my mobile I'm informed via a voice that my call time has expired. This has been happening once or twice a week now currently it happens daily. I reported it before and the agent informed me that she can't see anything wrong but I need to power my phone off, restart and all will be okay. This then allows me to make a few calls until the same happens again! Needless to say it's very disturbing and a nuisance. I reported it again on their website without any feedback other than a reference number. The situation is not resolved at all! Totally useless service and *********** staff not attending to their customer's needs.