SOS Prepaid Solutions - BAD SERVICE!

I have recently purchased property in a section title development. The previous owners had a SOS prepaid electricity machine installed in each unit. It seems like the owners have been purchasing electricity tokens from SOS but they have not paid the full amount to the Municipality for the units used. The COJ is now threatening to cut of power if they do not receive payment for this. Has anyone else incurred this issue with them & how do we deal with it?