STILL PAYING FOR CANCELLED INSURANCE SERVICE!!!!

I cancelled my cellphone contract along with my cellphone insurance about 9 months ago yet i have been billed for the insurance every month ever since. When i bought the phone I took up the insurance in the store and now when i enquire i am told i was supposed to call the insurance company myself and cancel. This was firstly not communicated to me and i have been billed monthly ever since! When i call the store for further assistance they do not answer, in fact all the stores do not answer just so i can get the details of the insurance company. I refused to pay that bill last month and telkom has decoded to charge me double the amount as a penalty which i will not pay because i cancelled that service and is not fair towards me!!!!!!! PLEASE can i get reimbursed and have that insurance cancelled!!!!