Endless frustration.

I am being charged for a device I never received and for an upgrade I was told is cancelled as per request.-- I received a call to take up an upgrade on a data contract from MTN. I did not realise the caller was in fact from Mondo. I never received the device on the promised date and called to cancel the upgrade within the stated permissible time period for cancellation. I have emails from the following agents from Mondo who all told me the cancellation was in process. : Amanda Lubbe, Lisamarie Barath, and Aston Pillay. Nothing happened. Finally I was assisted by Tyron Murugan. He at first also said the request was "submitted." This seems to be Mondo's strategy. Finally after more emails, Tyron Murugan told me on 20 July that the upgrade was cancelled. I was sent an email to this effect from Tyron. he said he would arrange a refund of the excess amount I was charged. However, I am still being billed at increasing rates for an upgrade I did not take and a device I never received. Specifically, I used to be billed R89 for the data contract from MTN. On 7 July I was billed R170.94 and now on 7August R229.00! I am supposed to be refunded from last month, not charged more. I am being billed for an upgrade I did take and a device I did not receive. I am extremely dissatisfied with the service. I have been unable to get anything done, money is leaving my account for a product I never received and the service from Mondo is shocking.