Bad service providers

I was with tech5 for 4 years and have had endless problems with my internet always off and on sometimes it would work great most of the time they are offline, I decided to terminate with them and move over to mweb , tech5 all of a sudden says I need to give them 1 months notice and refuses to let go off my line to mweb they are hodling onto it i run an IT company from home and have not had wifi since they holding the line to give it over to mweb ridiculous service contact them on a daily bases support says its out of their hands its with accounts , accounts say its not an issue on their side its up ane down vey poor service