Vox not delivering on advertised service

Terrible service and commitment from Vox. i have dropped my previous ISP with the promise of a good 250M dwonload line. To date i have been lucky if i get a download line speed of 50 or 60 M. I have contacted the Vox salesmen and the technical support and all that they can tel me is that they are getting correct line speed on their side. I have requested a technician to visit my home to assess the cause of service failure. i have got no response. This being said i now want to cancel as I am paying for a 250M line but get an average line speed of abot 10-20M..which i might add is not constant, common issues with "wifi with no internet." I was told that i have to pay a penalty if i cancel. i feel that this type of service is ri****.

The only reliable service is their account billing.