Telkom internet service disappointing

Good Afternoon, my Telkom internet connection is disappointing. Since 6 August 2018 Monday after coming back home from work (after 6pm) I find my internet inaccessible until around 11pm it returns to normal operating speeds. Doing this habit til this day despite calling customer care 10210 I'm forced to use an inconsistent internet network. I am on a fixed 30 GB x 24 months contract with a huawei B315-97B7. I have never missed a payment, I expect my service provider to treat me with the same professionalism or at least send me a message about it's technical issues - rather than for them to "bury their heads in the sand".