Shocking service

I bought a king size fleecy electric blanket last year June from Boardmans online. The blanket was faulty and the courier company came to collect it. They did not have a replacement blanket in stock and I told them that I did not want the refund but will wait for the replacement blanket. Its now May 2016. I have been calling Boardman's regularly to ask when I will get blanket. They have told that my query will be escalated and that someone will call me. To date I have had no call, get the same message from every one. I spoke to the Manager , Caroline Rammusa and I get the same excuse. I really don't know what more to do!!! ABSOLUTELY SHOCKING SERVICE