Halifax Trade Windows (UK) Ltd

I've used Halifax Windows for years and under the previous owner, they were very good, but recently I had a window fitted by them and noticed a gap between the window and the wall. I was told I have to pay £35 for them to dig up old if I can't find my warranty, but upon looking for it, I found it and sent it to them. The service guy came a few weeks later and said the window should have been fitted with restrictors which is normal for bedrooms, so he'll have to order some in and come back to fit them and I said if he's going to do that it's easier than taking the window out to to fix it and then take it out again to fit the restrictors, so he might as well do it at the same time as fitting the restrictors. I then rang to chase this up about a week later and was told the orders haven't been processed and will be done in another weeks time - in the meantime, I got a letter asking for £50 for the fitting although I had been quoted it to be free. I rang them up and they told me "bottom line is, you have to pay £50 for the restrictors" so I said i'll leave the restrictors as these cost a few quid on ebay anyway, and have the repair done - they agreed to that and then cancelled it and told the service department "not to bother" because I posted my experience on facebook and when someone commented with "jokers", I replied with "pricks". Maybe I shouldn't have, but maybe they shouldn't have quoted me a free restrictor fitting and then changed their mind as well. If I had done some research on the company before ordering, I would have seen other negative reviews as well but I relied on my previous experience with them under the previous owner, who sadly passed away a few years ago.