Depending on the nature of the complaint, there might be a requirement for a member to physically go to the location of the complainant. Or perhaps the complainant has called in looking for some sort of support. Each complaint that is made, either on behalf of an elder or by the elder themselves, is dealt with on an individual basis and then responded to.
In terms of something that's more severe, typically the appropriate response would be to ensure that the individual's safety, health, and well-being are priorities, and then it would go from there.