They take forever to approve service plan claim

They take forever to approve service plan claim. The first assist went awol,without anyone to take over her cases.The second requested documents from me of which I have send however she kept on saying she did not receive them. My question is when I joined them why did not ensure all documents send are clear for my record only telling me now when I want to claim. The third assistant asked for the same documents that I have already send and when I ask to see the manager then he's not available to speak to customers,then he said the team leader is the one that I must speak to,guess what he was also not available to hear my frustrations. Their service is the worst and don't advice anyone to join them unless they want stress and frustration.