Unhappy with service for refund.

Bought an electric blanket on the 9th April 2018 only to find 3 weeks later that it breaks. Took it back to the store and they refuse to refund me. They claim it has to be sent off for repairs. I do not want it repaired as I am not happy with the product but they refuse to refund. I called customer services and the line is constantly busy so I can't get through. I called head office to ask for assistance and they tell me I must just keep trying. So the shocking service I received in the store at River Square from the store manager runs right through the company to head office. All I want is a refund on the item and yet I am given the run around. Someone please sort this out!!!!!