Garmin link issue with Vitality - neither will take ownership

Many emails between me and Discovery assist, and me and Garmin assist, to link my wife and my Garmin devices successfully to Vitality, to earn points. Quite simply, Discovery and Garmin must have collaborated at a high level to create the opportunity to link devices, and when it all goes pear shaped, which in my (and my wife's) case it has, emails responses from both are slow and inadequate, and despite numerous requests to each part to TALK TO EACH OTHER (I have copied all emails to both), they simply will not. In Garmin's case the listening s****s aren't great, and often the contact person changes, so you start again. PLEASE, surely there is an appointed agent in Port Elizabeth (where I live) who is an expert in this process, and who can offer hands-on assistance, because at the rate we are going, and have for over a month now, we are going NOWHERE! Many thanks