Debit orders

Vodacom sent me a private message after I complained to hello Peter.vthey promised to call me with regards to Mt complaint. They still have not done so. My account is still not debited. With the continuing bad service I am fed, I want to cancel all 4 my contracts without been penalized. Vodacom has messed my account up, ongoing, and using my settlements I ve paid, for installments.. I'm fedup. WHT can I do do cancel my contracts without been penalized. I'll rather go to another provider that provides a service.