Thank you for sharing your battery experience with Oticon and sorry to hear how difficult Oticon and their HCPs are being difficult about it with you. That’s definitely a negative mark on Oticon and their vendors.
You may want to check out this thread below from this forum that discusses trying to find and buy the batteries yourself on eBay if you want. Removing the door to replace the battery can be done by yourself with a simple pointy tool and there’s instruction on YouTube on how to do that. But there’s a step to reset the batteries’ statistics that would have to be done by your HCP in the software, unless you’re a DIY who can do it yourself. If you’re stuck without a new working battery, it’s still better to change to new batteries and forgo the statistic reset so you can get the aids working again until next time you can see your HCP in Canada.