If you already got ur free brifter... I wouldn't bother then. You can maybe ask them how much they want to sell you that other brifter for, but I'd perhaps ask them to put full red on it. It seems silly that they would want to keep one brifter if they're going to warranty replace the broken one. I'd (if I was working in the shop) have sent them back as a set and given you the set of red. Why? Because it's going to be a PITA to ever try and get one brifter, and the shop could've sent the force stuff back as a set and sram wouldn't care. So I might write them and just mention that situation and that now ur bike is silly, but I'd maybe inquire at the shop level first?