DESPERATE FOR ADVISE!

I have been battling for 6 years to cancel a contract with them. After numerous attempts, phone calls, visiting outlets, emails and payments. Out of desperation I have decided to stop payment on this service linked to my account that has not been used for years (a ****le). My account has been suspended and still no service, feedback or response from Vodacom after I was promised that my query will be escalated. A loyal customer for more than 20 years - I am disgusted in their service and left hopeless in the situation.