Unprofessional attitude from Rawson Edenglen

I bought a townhouse in end of July 2015. At the time of registration process, the rental tenant paid electricity bill for August in full amount to Rawson Properties Edenglen in September and Rawson incorrectly refunded the same amount to the previous owner instead of paying back to me as the new owner. <br> <br> Now I am trying to get the money incorrectly paid to the previous owner back from Rawson Properties Edenglen and they have told me that is my problem to resolve with the previous owner.<br> <br> Surely as it is their mistake. They should be the one to resolve the issue caused by them paying incorrectly.