With respect... NowTV are quite transparent about what devices support what...
Instead of wanting to return the pass... you'd have known that your TV cant support 50fps... and if you have been waiting for that to change well... things dont seem to change that dynamically at NowTV!
I must say, im not criticising you... but this highlights a wider problem with boost.
As has been discussed many times in here, boost is a real pain in that its not available on all devices, and not fully (50fps) on others.
You'd have hoped that Boost would have been supported across all hardware at launch ... which it wasn't. Most should be capable of 1080p and 5.1... but perhaps not all are capable of 50fps depending on hardware.
As has been said many times again.... honestly its not worth relying on inbuilt TV apps for NowTV.... what you'll find is that they are either old, or worse still eventually unsupported... and rarely kept up to date.
Keep your sports pass, but "invest" £25 in a NowTV stick... yes I know that having the inbuilt app on the TV is preferable.. but the stick will give you a full boost experience with 50fps and is frankly extremely cheap.. there are other boxes available at more money but an external device plugged into a spare HDMI socket is the way to go to get the best possible service and should that hardware become obsolete its easily and cheaply upgraded and replaced without having to change the TV.
