Advice please, I have payed for a boiler to be fitted by a gas safe family member and he took an age to fit it, then came back a week later to fit the 28mm pipe required from the boiler to the meter, since then he has been fobbing me off about a sparky (his friend ) who needs to come and fit the thermostat before he can commission the boiler, been 2 months now since I payed him and still no sparky and still hasn’t been commissioned. He also never flushed the system when fitting the new boiler and I’m thinking my warranty is probably void I have 2 young baby’s and without heating , can anyone advise me what I can do about this?