Refund for Tumble dryer

We purchased a Samsung Condense dryer in March 2017, after complaints about the machines performance it was replaced in August 2017. The 2nd machine had the same problem and we requested a refund in November 2017. Dealing with the call centre was a nightmare, after a number of attempts we got to the correct department and was told that a refund will take at least 6 weeks which I immediately questioned as it seemed very long. 4and a half weeks later very little has happened and I will be surprised if I get my money back in the next 10 days.