Installation fault

Zoom fibre is the worst company I have ever come across. They installed the fibre cables incorrectly and now when I asked them to fix the cables as I need to make changes to my yard they are telling me I should pay R1700 for installation. They admitted to not placing the cables in the correct place but still insist that I should be the one paying. I’ve called countless times trying to get assistance but they have ignored me or told me their manager is away. This is the worst company I have come across they are not professional. I don’t understand why they expect me to pay for a fault that they admitted to.