If I don't want to renew my contract with my actual team which applied my P1 visa, can they just cancel my visa and oblige me to renew with them?

The decision to cancel a contract may have consequences. It is important that you understand all of the consequences including processing delays that may affect your career. There may be other issues that the consular officials were unaware of at the time that you processed your last P1 visa. I strongly recommend an appointment with a competent, ethical, and experienced immigration attorney.