Check it please

Dear Sir/Madam,
I am writting writing to complain about your restaurant "La Monte", which I visited last Friday. I wasn't pleased with the service, the prices and or quality of the food.
FirstlyFirst, the waiters was were very slow. We had to wait too long. Moreover, the pasta was badly cooked. Why? Because it is was too spicy. Secondly, the pizza was cold. It is  was (simple past) awful! You must correct your mistakes.
Also I was surprised when I got the bill. It was too expensive. You must understand that such money didn't cost your work. (Confusing sentence -- I think you mean " The food and service did not merit your work) .
I trust that you will give the matter serious consideration and that this won't be repeated.

Yours faithfully, Marya.