Be notified that after a year Cartrack increases payments

I am writing to express my disappointment and frustration with the increase in my monthly debit order I did not budget to pay such an amount for a tracker. This change was made after a year without a prior notice, and it was not stipulated in our initial agreed arrangement. The only thing that I signed is a installation paper that was given to me by your technician, no contract or Terms and Conditions attached to that and I still have proof based on this. So how did you get to a point where you can increase a payment that we have agreed on.

I wrote an email to customer service a week ago requesting that you downgrade my package to the original price as I did not budget for this increase and cannot afford the new amount, unfortunately until this day one has responded to the email. I will be forced to cancel my subscription if cant find a mutual solution to this mater, because this is not how a company should treat a client.