Bad service and unhappy client

I received a Milex airfryer as a Christmas gift from my daughter. I only used it once in March and it constantly switched off and on and spoilt my food. I took it back to Game with the receipt and in it's original packaging stating that I did not want it repaired but that I wanted a refund because if it's problematic on it's first use, imagine as time goes on. This was on the 20th Mar 2019. I called on the 8th April and spoke to Pamela at the Southgate branch. She was so rude and I again reiterated that I did not want a replacement but a voucher. Today I get a message that my airfryer has been fixed and is ready for collection. I do not want it but my money back as I am totally not happy with the product.