Mtn customer service

Mtn customer service is terrible Ported my number to mtn on the 14th Today the the 20th Number is on mtn but not working Mtn has no customer service number Went to 2 mtn stores 1 did a sim swop problem not fixed Second store can’t tell me the problem Very upset my business num is off coz of Mtn’s problems I think I need to go back to Vodacom