Worst ISP Not Releasing Line

I have been struggling with connection issues with the company for a few months while the neighbours used the same line provider but different ISP had no issue. Then I decided to rather cancel and move to another ISP. More then a month after I told them that I am switching to another ISP they still won't release the line. This is affecting my work and income. From below standard support to having a sore looser attitude, this really one of the worst ISP's I have ever been with and will not recommend to anyone.