Not paying chronic claims, no feedback being given

In the middle of 2014 we got to a stage where Resolution had stopped paying for benefits and a couple of months' benefits were owing to us. We were not informed why they wouldn't pay out the benefits, they would just leave the situation like that, leaving it up to the client to find out why they aren't paying. After several long phone calls with their call center, we found the issue was that we hadn't sent them my wife's renewed prescriptions, so we corrected the matter and were repaid the outstanding claims, so now we also send the renewed prescriptions every time we receive them, so as not to hold up the process. However now since March 2015, we haven't received any repayment for our claims for 3 months already. All claims are shown on my account, but they just don't pay out, and the worst is they don't communicate the reasons why, they just stop paying. I've asked the claims department since March already why they haven't paid out if they have all the claims, but I don't get any answer from them. It is inexcusable service, leaving us out of pocket, and not supplying any reason why, giving me good reason to stop the struggle and move to a different service provider.