Terrible customer service from Builders Warehouse

I have received the absolute worst customer service from Builders Warehouse.I purchased an online voucher on the 16th October but the recipient never received a voucher. Since then I have been in contact with several people sending proof of payment and correspondence from Builders.I was being moved around to different people and had to explain the situation over and over and send the same proof of payments every time.After two weeks of them not being able to find a voucher number, I asked for a refund. It is now another week later and I STILL have not received my refund. I keep being told that they are waiting to hear from head office and that I will be phoned back but I am still waiting. I have wasted hours of my time in phonecalls and emails on this issue. This service is unacceptable! Especially from a big company like Builders Warehouse whom I have supported for years.I am very dissapointed.