My MT4 account has stopped, my funds have been lost, time is money, why did it stop for no reason

my mt4-account stopps and since then I haven´t access to my account.they told me the following: "Thank you for your email. We are aware of the issue, as due to server maintenance clients temporarily cannot access their accounts. The master account is working normally. Please bear with us until the issue is resolved." several times I asked them , when the problems are solved , and their answer was always, that they understand my frustration and they will revert as soon as their accounting and analyses will completed.