Welcome, lindasbabies. It would help a lot if you could post pictures. It's hard to diagnose a "spot" without seeing it. However, curling leaves may be a sign that the plant is not getting enough water, especially if it has rotted most of it's roots. Do they have a leathery look? That would be typical for dehydrated phals. The repotme mix is fine, but it won't hold much moisture at the beginning, so you will need to keep on top of watering. Put the plant in a warm, low-light spot with as much humidity as you can manage and give it a chance to recover.
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