how to edit a contract?

Hello,

We arrived in Portugal in September 2022 and the previous tenant helped us by putting an internet / TV contract on the name of our company. (we rent through my husband company).

We would like to change the contract to a cheaper “pacote” because we don’t need the TV. 

I think I understood that we can’t cancel a contract before Septembre 2024, but can we edit it ?

I am sorry I am sure it is written on our contract but we only receive the bills, we never received the contract.

Thank you very much for your time.