Hi Aniebiet, MTN has increased the Betatalk bonus from 500% to 600%, there was an increase on deduction on the bonus account, but the main balance is still the same. The good thing about the bonus now is that 200% of the bonus can now be used for data.
All MTN tariff plans are good for calls and data and are unique, it depends on the one that meet your interest.
You can use this link to view all their tariff plan to know the one that meet your interest: https://www.mtnonline.com/personal/tariff-plans/
You can also checkout MTN Pulse.