over enthusiastic cell phone service providers

My mother who is 82 years old has been gifted a mobile phone just to be in touch with the family all the time and specially in case of emergency was baffled and aghast to receive an unsolicited  call from the service provider which was a recorded one and asked if the receiver who happened to be my aged mother was in "LOVE" and needed some expert advise on the matter?  My mother just could  not help laughing and continued to do so the whole day which was so infectious that everyone in the household was laughing and rolling the whole day!  Airtel, the service provider, in this case will do well if they filter receipients by their age before soliciting their patronage.

Now, the moment the mobile phone rings, my mother is reluctant to answer fearing the call could be automated  from the service provider and meaningless for her!!