Cancellation of the 2 x R59 contracts

I contacted Yellodata to cancel my contracts, as the additional data could never been obtained from Yellodata. The one contract was cancelled and the other one, which I thought was cancelled was never cancelled. I phoned and e-mail to no avail. I then noticed this month that I have a service agreement for an amount of R454 debited to my account. I have e-mailed ********** and the e-mails have bounced back. I have contacted client service and spoke to Ms Kahn who advised me that she would attend to the problem, but said that the supervisor was not available. I have tried again and told today that the supervisor is not available. I warned the consultant that it would not be advisable for me to visit their offices tomorrow to address the problem, as I would cause such a stir that the MD would have to appear. What is going on.