How should I respond to a secondary challenge to a SOE tender and procurement?

For the same supplier on the same issue of multiple challenges, the agency does not have to accept them all. At the second time it receives the challenge letter, it is perfectly acceptable to reply to him, "If you are dissatisfied with the response to the unit's challenge, you can file a complaint with the regulatory authority. Of course, if the complaint is of different content, the agency should answer again."