Really bad service from VODACOM FIBER.

Hi, i have a vodacom fiber service that works with Vumatel. Every couple of months my internet goes down for a week to two weeks, and none of the people at Vodacom Fiber or on the customer service centre can help me sort it out. On the 11 April it's the 5th time it's happend, and it's still off. So it's 9 day's today. They expect me to pay full price for half the service. My contract with them is ending end of April so i will be moving to a better ISP.