My lady remedial therapist told me she doesn't answer private numbers and land phone (can be public phone) numbers due to her bad experiences bellow:
1. Those people using these number made bookings but not showing. She has nowhere to confirm or track (will be on the blacklist).
2. Her question: Why they try to hide their numbers? If they don't trust her, then they don't need to contact her. Should respect to each other as she said.
3. etc...
She now even not take walk in booking. They left fake phone numbers or not show in the end. She learned from her bad experiences. I don't understand why those guys were doing this. I do agree with her "what guys performed (good n bad) in her shop, they will perform the same (good n bad) outside. If they are good people in the shop, they are good people wherever they go. "