requested twice for the insurance to be cancelled

i was very excited to received my DSTV explora on the special of R799.00. on a staturday in Feb 2015. i installed it and activated it. i requested the insurnace be cancelled as i have insured it under my house hold. i was told an email would be sent to the insurance depatrment. on the 10th of March i noticed that my account was debited for the insurance. i called in and explained they need to check the recording and credit me with the insurance amount. i was told they will look for the recording and cancel the insurance and credit my account accordingly once they have the recording. it is now the 10th of April and again i have been debited the insurance. i called in and was told not to worry as the amount debited on the 9th of April for insurance has been credited to my account. this is not acceptable i have given instruction for the insurance to be cancelled twice yet the funds are debited off my account. i have now requested the following information to take this lack of service further. all 3 voice recordings of my calls my latest statement showing the credits for the insurance that was debited off my account and a letter of apology stating this will not happen again.