Bad aftersales service

I did an upgrade with MTN or MONDO for the online deals on the 28th of July (Friday) and received my phones the following Tuesday. A total of 10Gigs promotional data was supposed to be allocated to me for the new upgrade but up to today 10/8/2023 no data. I have tickets logged with both Mondo and MTN where I was promised 24-48 resolution time which has passed but investigations are still ongoing. I keep being sent from pillar to post with no answers.