Beico - broken promises, no show since February

Beico did the compliance certificates at a property I purchased earlier this year. Upon taking occupation I realised that the toilet takes 40 mins or more to fill and I queried this with them. Barbara undertook to send someone round to resolve this. This was at the end of February 2024. I am still waiting, depsite having followed up with Barbara. Last time we corresponded she admitted that she had deleted the request because she has a lot to cope with, but even after this which was at the end of April, I have still not been assisted. It seems to me that Barbara and her team simply aren't interested in quality work and customer service. I will certainly not use them when selling.