Non-compliance with the contract!

Good afternoon, I have a contract signed with you, I bought the old version of OneBox a long time ago, I bought the so-called “perpetual licenses for $400” and use it forever. Well, that wasn’t the case. Now there is a need to restore work, and the integrators say the old versions do not have support, they say we don’t promise anything that it will work normally and they say switch to the new OneBox OS + PAY MONEY MONTHLY OR YEARLY! I paid for everything I needed, there are “perpetual licenses and an agreement in which everything is spelled out how it should work.” This is a direct violation of the contract. We will resolve the issue peacefully or through the courts. Give an official answer "Webproduction"