Don't want to cancel our WIFI

My husband has been trying on numerous accounts to cancel our telkom account, with the wifi. We had went into the branch and they advised us to call the call centre, in doing so we were holding on for longer than half an hour and as soon as someone answered and we told them that we would like to cancel the contract they informed us that they can not do it as their system is down and she gave us an email address to write to, asking them to cancel it. We have sent the exact same email from November last year and still no response. We tried calling again and all they do is put us on hold...<br> Honestly what else can a person do to cancel it, as no one ever gets back to us or replies. Firstly the Wifi has given us so man problems where it loses signal and we also tried to sort that out with telkom and to no prevail.