Yellodata fraudulant

Yellodata is unreachable. There is no way you can cancel a contract with them. I wrote an email cancelling a data contract; a year later, they're still debiting my account. Yellodata also sibscribed me to gaming, without my consent. I've been trying for four months to reverse this action without success. They're debiting my account with R499 faithfully every month. I just cannot overturn this. I'm powerless. They are getting away with this and no one can help.