Bad service from Mweb

My sister's ISP says they cannot activate her line because Mweb is refusing to cancel a previous tenants contract which is damn ridiculous! The previous tenant said he cancelled but his been fighting with Mweb for the last few days because they keep trying to deduct money from his account. Please just cancel the service so that my sister can get her ISP and you can deal with that person privately about funds. Cancel the damn service Mweb!!!!! And this is one of the reasons I don't go with Mweb. Shame on you