Extremely poor and *********** service from MTN

On 06/08/2020 I subitted my details for a Preorder for the new Samsung Galaxy Note 20 Ultra. I was informed that my Preorder was confirmed on 07/08/2020. The reference number is ***. In the confirmation email it stated that I will be contacted by the 19th to complete my pre order. This did not happen. I had to phone mtn on the 25th at which time I was assisted by Gamotso at MTN Direct in Johannesburg who informed me not once but two to three times that when I receive the phone the R 4000.00 evoucher will be preloaded onto the device. I was quite excited as the Samsung bluetag sale was set to start in september which meant that I could get great accessories at a reduced price. The voucher was never preloaded, and since then I have been fighting for 23 days for MTN to pull their finger out of their ****ses and to rectify their mistake. Since then the bluetag sale has ended. And now mtn wants to come and say we will now award you your e voucher. Its too late now. You are in breach of contract as I was promised that voucher will be preloaded which is wasnt and the contract is now null and void. This is not the 1st instance where I have had a problem with mtn but it will be the last.