Can we reject unsolicited trades

Hi team,

I live in Canada and I was wondering, can we reject unsolicited orders. Our firm is telling us that we have to sell only prop funds after many years of selling third party funds including prop. A client calls me and asks to buy Dynamic Balanced Fund (unsolicited, in line with his risk appetite). Can we say "NO, you have to buy our Proprietary Funds!" Isn't this practise illegal and punishable by the regulators?