Vodacom NOT helpful

I have placed an order to have fiber installed in my house and it has now been 4 months and nothing. They have given me an LTE router to accommodate me in the interim which was nice, but there is fiber running pas my house with the current ISP that has a contract to install the fiber. Every time I phone them they say it's my responsibility to phone the ISP but my contract is with them. How do I go about this cause I am now fed up with all of there excuses?