Telkom double debits account and disconnect customers

My contract sim is blocked by Telkom after they have debited my monthly contract fee ,what makes it annoying is that I tried contacting Telkom and none of their consultant could help . I spoke to Mpumi Ndlovu she said her manager Sizwe Mkhize will call me but however that didn't happened .when I called again to ask for none of their managers was able to help .