Worst costumer service

Worst costumer service I have ever experienced. My router has been running smoothly for the past year that I have been with supersonic. However these past weeks they no longer care about their costumers. I have been phoning a few times due to high ping and extremely low speeds on my router. Everytime they log a ticket and never sort it out. I app**** for fibre and was told that it will be installed within 14 work days. 2 months later not even a call to find out if I received it. Out of frustration I phoned costumer service again today to cancel all my business with supersonic and the person told me that I must email cancelation and what else can she do for me. Not even a question of why do I want to cancel. Since they dont care about their old costumers then I rather spend my money elsewhere.