High pricing error deactivated listings

My best listing has been deactivated for a few months now because of a high pricing error. It is a multipack, so many of the same item sold together, and the price hasn't changed. If it won't let me fix this where it is reported in Account Health, what am I supposed to do to get the listing active again??

I'm concerned that this is something to do with the hijacking of the listing over the summer, a chinese seller took over our listing and priced it lower, could it be that the value of the listing has now been too low on Amazon for it to accept our price?