Terrible service

I recently requested installation from 123Net for a new home fibre unit, they were still completing civil work and couldn't run a signal but completed the installation at home, I had no choice but to pay my current Internet service provider to avoid being without Internet. I sent them an email requesting my subscription start at the end of April 2026, I got a call from agent stating that the interest is now connected and requested payment, how can I pay for 2 different service provider.