They hold onto your deposit and their cars are bad quality

I am horrified that after 7 days from when I dropped my rental off, I am still waiting for the amount held on my credit card to be cleared. I received my invoice on the 1st December, but to-date (5th December), the deposit amount has not been released, despite calling Avis and requesting this be done. I normally always hire through Tempest or Europcar, and they never hold my deposit for longer than 24 hours after issuing my invoice. Also, the car I received was sub-standard vs. the same group cars I receive through Tempest and Europcar. I will never book through AVIS AGAIN !!!!!!!