My bill has gone up $48.30

Hi, I have had my current plan for many years and without any notice whatsoever, my bill went up $48.30. My promotion was up a long time ago, so I know that that was not the issue. I also looked at my statements and they do not have any "extra charges" other than saying my plan has now switched from $96+25 for 500mbps fast+xFi Complete, to $134.40+34.99 for the same package.

The only thing that had changed was I had a late payment to try to adjust the date with which I pay the bill whilst fully accepting there might be a late fee, yet no late fee appears on the statement. There is also no price hike warning on the statement either. Expecting a price hike of nearly $50 for ONE late payment in the entirety of my service is insane. I have already paid the late payment, but I cannot afford $169.39 after just paying $121 (minus -5$ for autopay).