Long existing clients get terrible service

Telkom's service towards clients which have been with them for at least 15-20+ years is terrible, as one example we have 2 voice lines and a data and a fax line which share one line which went off, completely disconnected, over a week ago and they still haven't been fixed. I reported these faults via the call center on 25/04/2016 and then received notifications on the 29th only to be informed telkom only reported the faults on their side 4 days later and these issues still haven't been resolved. These lines are used for bussiness, which some of, we actually lost through out the course of this week because we couldn't maintain contact with them. I understand that certain things take time and that you guys probably have a lot to deal with on a daily basis (even more so due to the lack of service delivery) but you'd think that someone who's been paying for your products and services for roughly two decades would get some sort of preference. Telkom, if we're wasting our time and money with you please let us know so that we can rather spend this effort and energy to find new service providers