/kloc-there is no routine for refunding within 0/5 working days. According to the relevant public information, the other party promised to refund the money within 15 working days, so a contract was established between the two parties. In the absence of other invalid circumstances, the contract is valid and protected by law. You can ask the other party for a refund within 15 working days. If the other party fails to fulfill the refund obligation, you can take legal measures to ask the other party to fulfill it, such as suing.