I'm pretty sure they are referring (or mean to refer to) to 'breakage costs' which refers to any penalty on redeeming a mortgage before maturity.
Fixed rate mortgages would be expected to carry breakage costs, for variable rate mortgages, it could vary,
INBS were recently brought up on charging unfair breakage costs-I don't know if breakage costs on variable rate mortgages are illegal, but it is probably illegal for them to be excessive.
Your first point of call should be to read the loan agreement.
If the term 'brokerage cost' is accurate, all I can think that it refers to is a fee to cover the commission the bank would have paid the broker used (if any) when the mortgage was taken out, but I'm not sure if customers are ever held liable for these.
Again, this should all be detailed in the loan agreement.