Cowboy builders devastate a family home

These cowboy builder have left a family of 7 with a house that’s not livable please share. Clients works Mick Crosfill Under NJK Builders - Nigel Kay. All work was organised through Mick and we didn’t see Nigel till the end when we were trying to sort corrections of work and to continue working with them. Once it went to pot Nigel seemed to take over but then all communication stopped with both parties