ask CanImm again, Tks

Thank you for your replying last time!
My previous employer does not want to give a contract letter and we did not sign any contract when I began to work for him. He gave only one letter about my employment history in his company. The letter includes wages,benifts, work hours, job description, etc. So, does this mean that this letter can serve both contract letter and reference letter? Do you have any suggestion if this letter does not work?

Thank you so much!

John