Battle to get moth to month contract cancelled

I sign up for a month to month 100G data contract. Payed R520.06 0n the 03/04/2024. Received the unit on 17/04/2024 get it connected on 18/04/2024. On 26/04/2024 I contact Mtn and want to upgrade to a bigger package I get told sorry you cannot upgrade you must cancel first contract and sign up a new contract. i agree to it the lady sign me up for a new contract and told me just to hang on she put me threw to cancellation department. I get cutoff call again ask to talk to cancellation department after been put threw to 2 other departments still could not get contract cannot cancel need to take to the unit in first. That's not what lady helping me with new contract told me she say they will arrange for courier that was after more than 30minutes on my airtime. Email received on 29/04/2024 "Kindly be advised that I have advised MTN to redirect your query to Rewards Co, as you would like to have the device collected and since you escalated that request within your 10-days cooling off period, I am certain that they will be able to assist in regard to the collection." Emai received on 03/05/2024 "Please note that the below ticket will now be resolved on my end. I humbly apologize for the delay and inconvenience caused to you." Email received on 06/05/2024 "Kindly be advised that your query does not fall within our space, and I am unable to assist in regard to your dispute. You may email - *** / *** The below ticket will now be resolved on my end. I humbly apologize for the delay and inconvenience caused to you." All the emails was sent by "Hope Nsibande MTN Direct Senior Support." Email received on 30/04/2024 "Dear Customer, We appreciate your patience in allowing us to resolve your query. Your reference *** is in progress and will be resolved by Hope Nsibande. If you would like to add any additional feedback, you may reply to this email. Regards, Mobiles Plus Support"

Note on 01/05/2024 received a bill from Mtn for R663.53 when the intiall contract is for R269 per month and a payment of R520,06 has been made on 03/04/2024.

On 04/05/2024 I take the unit in to a Mtn store for cancellation as they doesn't want to pick it up. I get told by the guy in store sorry we can not help you today as the department doing it is close and only open weekdays from 08:00 to 17:00 that's the first time I heard that they only accept unit in the week. At the end of the day the cancellation was only accepted on Wednesday 08/05/2024. Get sms from Mtn on04/05/2024 that contract is set to be cancelled on 09/05/2024 but consatant wll be in touch, on 14/05/2024 I only get sms "We've change the cancellation date for your *** MTN line to 15/05/2024. You'll be billed accordingly. Have a great day"

Now what happen to my R520.06 payed on 03/04/2024. On 26/04/2024 I signed-up and payed a amount of R500,50 for more data. On 29/04/2024 DSV courier try to delivered the other device but they cold not get device delivery authenticated they driver contact his supervisor who contact MTN. 4 hours later get notify they have no reaction from Mtn. Up to date I have not received the new unit or any contact from Mtn or courier company. But they still want to bill me after receiving a amount of R1020.11 from me.