Poor customer service

I bought a property this year which was transferred end Nov. The fibre line is still active with VOX as the ISP from the previous homeowner. To help me, she logged a ticket to request they release the line earlier than 31 Dec but they are adamant that it won’t be done before then even though she no longer lives there or owns the place. They’re getting the cancellation fee paid anyway so why keep the fibre line until the 31st? There’s no logic in that. So I’m stuck with no WiFi as my fibre line provider and ISP cannot reconfigure and activate the line if VOX won’t release it. And I work from home… Don’t even call their Customer Care as you get no results there either