Review Sudden route change

I normally board a bus(9191) from Midrand in the afternoons which goes via Highgate but to my surprise this afternoon the bus driver just made a U-Turn just after Marainsburg offramp and said he is no longer going to Highgate because there was traffic jam I had to get off and walk to Highgate and the place is not safe to walk...why do we suffer like this for your services tht we pay for?