No resolution from November

My car was in Renew-it's care in November. The work was completed, although as I raised and complained about since then, the work completed was very shoddy and in fact incomplete. I sent photographic proof and although I have had a few contacts, no confirmation in view of a courtesy vehicle at every time since last year. When I phoned back 2 weeks ago to find out what is the latest, and was told Keren who was dealing with my case has left. This is from November last year - what is happening? I was promised a call back 2 weeks ago, but unsurprisingly this never happened.