Is it permissible to take a portion of the inventory available in the pharmacy to compensate for an unauthorized 50% deduction from the agreed-upon commission?

A claim of injustice requires proof, for the Prophet, peace and blessings be upon him, said: "The burden of proof is on the claimant, and the oath is on the one who denies." This can be proven through official channels. It is not permissible for either of you to betray what you have been entrusted with, for the Prophet, peace and blessings be upon him, said: "Render the trust to the one who entrusted you, and do not betray the one who betrayed you."