Calibre E3 Facebook messenger

Hi.. I just bought my very first TAG Heuer and very proud of it, but I'm having some difficulty on notifications and stuff.... sometimes I get notifications of phonecalls via normal phone or messenger, but I struggle calling back... or if I do call back... I cannot end the call... how can I sort this... I feel like having a smart watch is a waste of time... because I still have to use phone to cancel calls or view notifications