MWEB - no service but expects payment

I'm so angry I can spit. Requested ADLS to be changed to Fibre, eventually had to cancel my fibre application after 8 weeks with no response. Now request payment from when I requested ADSL to be changed to Fibre, cause I didn't "cancel" my ADSL. Did I have the joy of usage for the period? No. Do I have to pay for a service I didn't have and subsequently had to cancel due to their incompetencies? Yes. But what really gets me riled up, is the threat of reporting to credit bureau because I didn't pay for a service I didn't receive.