SUPERSONIC WORST ISP EVER

It has been a month and a half since I have given cancellation notice on my account yet they still refuse to release the fibre line. Services were suspended for non payment according to them but now all has been allocated except for FEB which was paid and they close the query as it is back to normal. I wonder how the relevant authorities can allow companies like to to operate. Do Not Do business with them, they staff members told me I cannot cancel this service