I employed GWBS to undertake some renovation work. The building work was done to a reasonable standard. As extra work I decided on underfloor heating my wows began! I had issues with its installation they ignored manufacturers guidance. The floor was laid on an uneven floor but they had fallen out with the subcontractor and wanted me to chase the works to its completion. I had difficulty getting the work finished. So I refused a final invoice, of £450. Over a 3/4 month period I managed to find someone to finish the flooring.They did the best they could it's uneven in places and the heat isn't uniform. I still needed electrical sign off - I was chased for updates. I asked for them to stop harassing me, we agreed to accept the job as finish they would not contact me again. The subcontractor contacted me - the electrical checks were done. Having promised they wouldn't contact me, they did, asking for payment. I responded to the text, yes (mistake) but blocked their calls. A few months later they appeared at my house, I was at work. I contacted them immediately via email. They threatened me with debt collectors if I didn't pay that day. I offered a good will payment they refused I endured a day of emails, claims of letters said they sent, sighting recorded delivery, of out of context text messages. In fear of debt collectors, feeling under duress and stressed I paid them! I am now considering should I take legal action for distress and harassment.