Solo Betta supplier details required

I bought a Solo toilet/cistern set at the Tokai branch. Went back numerous times to inform them that the cistern was faulty. I took videos as proof. Colin Miller asked for my proof of purchase which I could not provide, but I gave a bank statement as proof of the June 24 purchase. I was assured that they could then go back and check their system. That was in October 24. I went back in December and again on January. In Colin’s absence, Mack assured me that he will contact the supplier after the holiday closure. I have called again this morning, but I haven’t received the call back as promised. I’m just about ready to contact/ liaise with the supplier as well as involve the NCC, but will give them a chance to respond to my complaint on Hello Peter.