Unresolved query by TFG customer service

I bought a cellphone on the 5th of October 2020 at Sterns Mandela Square and they signed me for cellphone insurance which I did not apply for as I had indicated to the sales consultant that I don't want it. On the 13th of November 2020 I sent them an email requesting the insurance to be cancelled of which they did but I was not refunded my money which they had deducted as a premium for the insurance. I sent them another email requesting the refund and they send me contact details of an insurance company and they informed me that I must ask for a refund from them since they are the underwriters of the policy. I responded telling them that they must contact their insurance company and recover my money for I don't know those guys at all. I was promised that it will be resolved but nothing was done up to today they are just quite.