Mobiworks not to be trusted

After doing survey and have reached threshold I can't redeem it tells me account not found.how is account not found when I can log in and do surveys and when I click redeem it click me out and ask to sign in and when I sign in with correct details it says account not found.but when it's just doing survey I log in just fine.these people they are playing with our minds I can't even withdraw my money just beware guys