I picked up the TRP Spyke mechanical calipers this year. They are absolutely fantastic. They have a plastic grime guard which probably helps. They are, as far as I know, the only dual pull mechanical around. This means you don't have to adjust them nearly as much. Just add some cable tension as the pads wear.
You can find them for cheaper on Ali Express, they mountain bike version (Spyke, roads are Spyre) are really hard to find in Canada. If you already have discs you can just order the caliper.
Highly recommended. Didn't have one issue in the bitter cold, though when I was shredding some gnarr pow earlier this year I think they got some snow somewhere, and I lost some performance briefly.
Of course, you need a solution now, so I'd pull whatever you have apart and see if you can get it moving again. If it is just the cable that's an easy fix. Disconnect the cable from the caliper and see if you can get it moving. A new cable is cheap and easy to replace. If you need a temporary one I've got a POS Clark mechanical you could use in the meantime.
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