Cannot receive calls from other networks

The number *** cannot receive calls from other networks at all. We have been to vodaworld numerous times and did sim swap 4 times. We are told its an LTE issue and so may other reasons and it has now been 2 weeks no luck. The other time told \maybe it will work fine in 7 days"etc....Extremely poor service from Vodacom in this regard.<br> Neville Makopo"""