Investigate and resolve complaints promptly: acknowledge within one week, resolve within four weeks or, in extraordinary circumstances, update the client with reasons within four weeks and resolve within eight; provide an easy complaint form while accepting complaints through any channel; handle complaints involving third parties while remaining responsible; charge no fees; record complaints, actions and outcomes; publish clear, fair procedures defining when a complaint is made and which channels are monitored; and analyse root causes to fix recurring or systemic problems.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.