Telkom fibre is nothing but trouble

I was persuaded by a Telkom agent to migrate from Telkom LTE to Telkom uncapped fibre 20mbps. The fibre line was installed at the end of May this year. Since then I have had nothing but problems with my fibre connection. Problems include not being able to access my network filing system, continual buffering on YouTube and slow connections. The integrated Sim cards have no data loaded on them either after spending almost 2 hours at the Telkom store to get them. I now have no Internet at all after spending more than 3 hours being sent from pillar to post by phone, each time waiting for 20 minutes or more for a response, still without the person answering being able to help. At the last call I was told to switch off my router so that the ports can be reconfigured and then to phone back if this does not work - lo and behold it did not and I am again sitting listening to one sales pitch after the other for the past 11 minutes without an answer. I am convinced I made the mistake of my life switching to Telkom fibre!!!!!!! Who can I contact to get this issue resolved???