Upgrading my TELKOM fibre from 10MB TO 20MB

I have been struggling now for 3 weeks with TELKOM to upgrade my fibre line from 10mb to 20mb. It took them 4-5 days to install the line and for a upgrade you apparently have to wait months. Probably spend over 4 hours on the phone and everytime I get the same response they will call me when they have fixed the line. The biggest issue is that their systems show that I have been upgraded to 20mb but seems like the switch over hasn't been done at the exchange and to get their customer support line to understand the issue is a nightmare... Really tired of companies that don't care about customer service after they have you as an customer. This is by far the worst service I have ever received in my life!!!