Poor service and incorrect debit order

I have been incorrectly billed three months in a row and after being on whatsapp numerous times in the last 2 months nothing is getting resolved. They are still loading the incorrect debit order. They offered me a free VOIP account and now charge me for it without warning and when i request a cancellation they are still making me serve the cancellation period and PAY. I never asked for the service and i don't want it if they cannot stick to their word. I changed my internet package and they took 3 weeks to commission it abut still charged me as if i was using it all along. Poor customer service and inconsiderate towards customers. I have been loyal to them for 3 years but its time to find other providers that take their customers seriously