Billing for ADSL and Fibre

Please never ever be with Telkom, I am having worst experience and still didn't sorted out. Here's the story Vumatel came to my home and said I can take Fibre and connected with Telkom free of installation charge with same monthly charge, I agreed. They apparently installed a wrong router and here it starts, Telkom is billing me for both ADSL and Fibre, nobody could help me, I am calling billing- they route me to Sales. I am called to Sales- they route me to Vumatel. This is happening for months now. I kept on paying some money to them because I don't want it to be dis-connected. I've decided to cancel this but before that I need to claim my money back.