Got this message from Spark:
From 4 April 2025, each time you renew your Value Pack, you'll get 200MB of bonus data (up from 100MB). The maximum Data Stack allowance will also reduce from 10GB to 3GB. If you have more than 3GB stacked, no more bonus data can be added, but you'll keep your current stack as long as you remain on an eligible Value Pack. For more info, go to spark.co.nz/datastack
Gonna switch to Zeronet or Mighty mobile
Few complaints about zeronet around here so maybe steer clear.
MightyMobile or wait for a Kogan sale perhaps?