Shocking service

I cancelled my order after I was told that the delivery would take 7 to 10 days. The order was not out on delivery as yet. On the Friday the delivery company phoned me about delivery and I told him the order was cancelled. When I phoned customer service back it was never cancelled. Long story short is that every time I phoned customer service back there was an issue with the cancellation. I was told they would refund me but now I have received a voucher instead. I don’t want a voucher! I want my money refunded!