Shocking Fibre service from Supersonic

Joined Supersonic in My 2023 just at the time of the seacam cable being damaged so had no fibre connectivity for a few months even though i paid monthly from inception. Then since July / August very bad signal to the point where the system would buffer to such an extent that watching was impossible. Nobody has been able to resolve the problem and as of Friday PM i was politely told by a senior member of staff that cancelling my service seems like to only option. I have done that now to advised that there will be additional cancellation fees for doing this. I should actually be getting a refund given that i have not been able to use the service for 7 months now despite paying each month. Very unhappy and dissatisfied.