Vodacom fibre Cancellation

I have been trying to cancell my vodacom fibre contract for 8 days now , it is for a house being rented by tenants I am in zambia and all the numbers supp**** by vodacom do not accept international calls . I have sent numerous emails , logged service requests, asked for call me backs , and there is no response , tried Tobi who just says call *** that number and all their numbers just say check number and try again How can this be resolved Very unhappy i have been a customer for 4 years and trying to cancel something should not be this hard !!!