common wealth brokerage and financial service

I have a cashiers check form moneygram payment system for $4,620.00 and was told to deposit it and I would get the rest of the 246,000.00. I believe it is fake. I was told to call them as soon as I get home after depositing. Claims officer Jim Mosbi. 1-647-719-0128. drawee was BOFK,NA. remitter Sandra Povick esq. CFE Agent for moneygram. Sept 10 2015