Telkom Adsl poor for over a week and callout fee

Since Last week my ADSL speed has been very slow. I've phoned Telkom they tried sorting this problem and no solution. To make matters worse they telling me that for a technician to check there is a call out fee of over R300. Now I would like to know did I cause the speed to be slow or is it your poor quality and the R300 a blatant ripoff whatabout my lost time and expense? I,m currently in the middle of preparing for my exams and rely on this WiFi. Please sort this problem. Can't wait to switch to fibre livid customer.