Some providers do include a 5 or 10% price hike every year under the excuse of 'muh inflation' plusnet did this.
I asked to keep the same package - they downgraded us to a different package without making it clear that its what they were doing. I thought we were saving money or getting a discount for being a long time customer and we didnt figure out what had happened until we received the confirmation email with all the information and details about the new contract, what we were paying for (the package) and of course the price and when the new contract began. We had already agreed to renew and all the administrative work on both sides was done.
Of course we had the 14 day grace period to fall back on but our new contract was due to start on the 2nd of November and after how we were dealt with there was no way we were going to carry on with the service so we cancelled the service and renewal.