How to get more storage from MEGA?

I have 15 GB from Mega as a free account. There are ‘get more bonuses’ as storage options, but all of them expire 6-12 months.
Is there any permanent bonus upgrade for Mega, like coupon or something. Yeah, don’t suggest me to upgrade my account. Know I it! ;P

Wait…isn’t normally 50 GB the free Storage on Mega or did they change that? Well, if you want more, just make a second account.

Mine is just 15 GB;

Oh well, I will keep making account after account after….

Okay, that’s weird �.o

I don’t know what this *Subject to your participation in our achievements program. is, but maybe you should try it?

Ok. I have looked around and people says it is about geo-location. For example, Peru and US get 50 GB and some others get 15 GB.
But it may be wrong. I made a new account and it gives 50 GB and 35 GB of it will expire after 1 month.