Think I was scammed - Avis employé IT Manager HCLTech

When I was given an offer of employment, I wrote to the company to verify if the person who contacted me was really an employee. I did this a number of times but never got any form of an answer. I was given a PDF file that pretended to be a letter of employment and I sent it to the company to see if it was legitimate, but I never got a response. I was given fraudulent checks and was told to deposit them in an ATM. I did that once and it cost me my bank account. The so-called letter of employment had conditions that were totally unlike the conditions offered to me in the beginning. Be warned!