Substand work

I requested quote from NTBD maintenance & plumbing did get the quote and asked them to proceed with the work. They came out on the 31 May 2024 they were payed in full for there work but after 2 days there substandard work started to leak again we phoned them to come out and fix there work. But when we phone them and ask when they will come and fix there work we just get hanged up by the persone on the other side. It is now the 26 June 2024 and still so they have not came back to fix there work