I bought a glo sim sometime last year to be using for browsing. Whenever I buy data, I notice it expires within 48hrs, whether I make use of it or not. Because of that, I stop using the line for anything data. Recently, I migrated from the brekete plan to 11k/sec tariff plan. Within last week, I bought data on the Glo line but wasn't able to monitor how long it lasted because I exhausted it in few hours. Yesterday, I needed to respond to messages online and mtn network was slow. I bought a 1gb - 1mnth plan from glo. Before I could use it, mtn network returned and I just switched back to MTN without touching the Glo data. Then this evening, I got a message that the data I didn't use his expired.
I bought the gb yesterday because a part of me suspected this would still happen. I don't know if there's a way I can fix this problem. Pls help me if you have experienced something similar and later resolved it.

Call customer services

Simply call Glo customer care centre.

Looks like you're buying from those data sellers - CGIFT (as seen on the message)

Have you tried buying directly from Glo to see if the problem is the same?

Call customer care na, baba.