Sunny made a contract with Mandy selling her his television set for $10,000. When he delivered it to Mandy, he told her that he would accept $8,000 as he had moved to a small apartment and no longer had the necessary space for the television set. Mandy gave Sunny $8,000 and her Snoopy collection valued at $250 in exchange for the promise. One month later, Sunny changed his mind and requested Mandy to pay him the outstanding balance for $2,000.
Advise Sunny of his legal position.