I purhchased a Devimat underfloor heating mat to go under some laminate flooring. Before I purchased the mat I checked with the store to find out what was involved with the fitting of the mat and would it be suitable for the type of flooring. The shop manager advised that it was a simple DIY job to fit and it would be fine under laminate flooring so I purchased it at just under £400.00. I am not a good DIY'er so I employed electricians to install it following the instructions in the box. The heating worked OK for a few days (not great though just about warm when you put your hands/feet on it) then it started 'tripping' the main house fuse box RCD, once every couple of hours and then after a while straight after switching it on. I called out an emergency electrician who advised that fluctating current in the mat was causing the problem and disconnected the mat from the power supply to avoid further problems. I rang the store and and they advised that I should go through a 'simple' checklist that they would fax to me before they could do anything further. When I received the list it was pretty techincal and obviously designed for an electricain to go through.I explained this to the store and they admitted that they thought the same! They then advised that I could ask for an official Devimat engineer to come out at a cost of £400.00 + VAT which I would get back if the problem was deemed not to be my fault! To be honest I have had enough and I want my money back, plus the cost of relaying the floor as I feel the mat wasnt fit for purpose from day 1. Can I do this and if not what are my options? Thanks in advance