Taking far to long to answer calls

So Mtn advertise the number +***0 on their contact us page on their MTN Group page, but after listening to the same 3 lines of Irritating music for 5 min and 7 min (yes i made 2 calls). just to get to an operator, to redirect my call into another queue for another 8 min , I asked to speak to someone in Corporate. <br> I hanged up after being on call for 16 min , and has yet to be helped