Which is unfortunate but it's a risk you take if you pay for a service, any service, but notably public education at a time when the cost of everything is rising.
I still maintain it's unreasonable to hold the government up as some ogre for raising taxes which will (directly) affect those who are financially better off than most but it's fine if you disagree.
I don't believe those paying independent school fees are being treated harshly by the government, nor do I believe (in case it wasn't clear) that independent schools should hold charitable status. While Labour have decided not to remove it for the time being, one lives in hope.
You pay for a service. Those that provide that service are seeing a rise in costs and are passing that cost onto you. It wasn't unexpected, your children have already benefitted immensely and neither their world or yours is likely to collapse as a result.
You're, presumably, unlikely to end up on benefits, your children are likely to still do well educationally. You can no longer afford a privilege, that's all. There are much more important government decisions to worry about.