What can you do if a seller just changes his conditions? "Even verbal contract is binding"

Last week Ambos partner Isabelle Buelens gave more information on national radio (De Inspecteur – Radio 2) on unilateral changes of the price. Due to the economical climate and the energy crisis, a lot of businesses are updating their prices. What can you do as a contractual opponent? Is this allowed? Listen to the interview on Radio 2

Wat kun je doen als een handelaar zomaar zijn voorwaarden verandert? "Zelfs mondeling contract is bindend" - Luister Select | radio2