Is it permissible for believers to be bound by conditions when the employer changes the system that was verbally agreed upon and on which the signing of the contract was based, even if this agreement was not mentioned in the contract and it was not agreed that the system would not be changed?

It is not permissible to disavow the agreed-upon terms of a contract with a company due to a change in the overtime system, unless overtime was part of the official contract's clauses. If overtime is a separate contract, then it is permissible to refuse it if you are not satisfied with its terms. However, if overtime is stipulated in the original contract, the company is not allowed to change it without the worker's consent. If the company changes it, the worker is free to choose, and he may accept the new terms or refuse them and leave the company. The terms of the official contract must be adhered to until its expiration. If you wish to leave work before the term ends, you must notify the company in advance according to its terms.