Sick and tired of Vox telecommunications

I will never in my life suggest any one to use this service providers.i cancelled my subscription with them after 2 years and now I get call from a debt collector that I owe Vox over 3grant.where is this coming from.......never get a contract with them as you want to cancell you have problems.also in the TNCs they say after 2 years the router is yours it is bull****.....I even told them they are welcome to fetch the router.up to date no response.the staff lack training thats why we are in this situation.