Fibre line not activated after months

I have been waiting for weeks for Vumatel to do a simple object number re-allocation. Because of a mistake by some previous owners, the fibre box in my house is currently linked to a street/house number 34 instead of 32 (there is no 34 on our street). My ISP has placed an installation order with Vumatel for 32 and has now been trying to get Vumatel to simply link my object number to 32 but we've been going round in circles. Tickets get logged but nothing happens. I keep contacting the ISP but there's nothing that they can do because Vumatel is not getting back to them. I have called Vumatel myself on various occasions but they keep telling me that it's the ISP that need to contact them.