Disgusting service by MTN

I upgraded my phone on the 13th of July 2023, and they were running a promotion for mastercard vouchers for the first 1000 customers that upgraded to Samsung A54. I whatsapped my details on the same day as requested and all documents that was needed. They confirmed that all was verified and I qualify for the voucher, sent them my details for the delivery which the feedback was it will take 5-7 working days and delivery was to be by the 28th Of July which never happened. I enquired and was advised there was a problem with the delivery and they are sorting it out and I will be given feedback which never happened. I have been following up with MTN via the whatsapp nr that was provided and the last communication was on Friday the 11th when I was advised they'll follow up with the courier company and I'll get feedback after I again enquired. It doesn't take that long for feedback with a courier company and I should've received the feedback by now. I've emailed their complaints department on the 10th and up to now no response. I'm disgusted by the way MTN treats their customers and once I'm done with my contracts I'll take my business elsewhere where clients are valued and treated with respect.