Complaint Review: city visas

Paid City Visas £1800.00 to do my application to Canada 2 years ago. I had problems from day 1 with these clowns. They changed my caseworker more times than I can remember and have now stopped replying to my emails, phone numbers are just ringing  so I went to birmingham and guess what NO MORE CITY VISAS Birmingham office so I then drove down to London office which again no one there its just a building where businesses are registered. I dont know who to go to now or where to complain. STAY AWAY FROM CITY VISAS and IF THEY RE-APPEAR please let me know. Just apply for immigration yourself to your chosen destination atleast you know its done that way.