Telkom Fibre - unnecessary call-out fee

I logged a fault when for a period I was only getting a download speed of less than 5Mbps on a 10Mb line (Usually measures at ±9.5Mbps). The call center made me reset my system a few time, they reset things on their side and still no change. The call center confirmed that there was no restriction on my line due to misuse. A technician came out and confirmed that there was no fault on my router and/or wiring. They closed the fault without any communication. Miraculously, a few days later the line was stable again. I am now being charged ±R1200 for "unnecessary call-out fee". This is completely unfair and a waste of my time to phone and dispute for who know how long. If it is confirmed that there is absolutely no fault on my side and that Telkom was not providing with the service I am paying for, WHY do I have to pay a service fee. I'm already paying a subscription fee for a service that a did not receive.