Monarch just took over from Mills in St. Louis, Mo...

Monarch just took over from Mills in St. Louis, Monarch accepted late January payment for Mills yet never forwarded to Mills. Now Mills submitting collection actions less than 2 weeks after, sounds like collusion on both parties part, have all receipts . But Monarch says i would have to vacate if they return money, since they used for deposit, although deposit already on file, secondly.the former did not give tenants notice not to pay Monarch, same office personnel,,, SCAM if you ask me...