Mtn data bought with Points 1g bought only 200mb used then Zero - I tested x4 times

Mtn data bought with Points 1g bought only 200mb used then Zero - I tested x4 times

I have the proof that repeatedly when buying Data with points I only used 70-80% then it was finished.

I tested buying with airtime and I get my full Data bundle usage then same device, same everything but buying with points I only get around 80% usage.

This seems to deliberate to be an error.