Appalling services

Appalling services from Standard Bank been to two different branches 3 times' to change my mobile number as i lost my old phone. Everything is still linked to my old number despite their staff saying changes has been made and should reflect within 10 minutes what is funny is that when I phone in their internet banking division advised nothing has been changed on their side I've never received such bad service before. this is causing major frustration and an inconvenience no reply from their support division via email if you are looking for that customer service standard bank is a no go because there is no service!