Vumatel cause damage but I must pay for repairs.

Once again this vumatel is giving issues, customer service with this company does not exist. A technician came out to see what the issue is, their own technician said the previous technician did not install the the wiring properly and this has cause the wiring to get damaged over time. I called in to vumatel tell, could not get hold of them, I then contacted my ISP they contacted vumetel and was told I will have to pay for the line to be repaired they won't pay. How is it that I must pay for them messing up the original install that caused the damage. This company doesn't really cat to assist as they know that it's their finre line in the area and if you want finre you have to use them. Everytime I deal with them I feel like pulling out my hair, a nightmare company to deal with.