Billing us even though we have said no to their service twice

Billed for another years subscription x 3 even though we said verbally and in writing that we no longer required Trudon's services and was done before the cut off date. Yet Trudon agents contacted our stores directly, asking again to go ahead with another year’s subscription but these people are not authorised to give permission. The behaviour of Trudon agents trying to get a yes to their questions even though they have been told by managers that we do not require any subscriptions is not ethical. No matter how many calls / emails we send we get zero response and nothing is being done. We have escalated this complaint to Roshni the manger but this is further ignored.