Apex Credit Management Tracked us overseas

bowden31

Hi,
We have a bit of unusual situation here and dont know how to deal with it properly and will appreciate your expert opinions and comments in this regard.
My girlfriend and i moved to an Asian country almost two years ago for work. We were going through some financial hardships in UK and my girlfriend sought advice from "clear you debt" scam company who has run away with over 4000GBP since without solving the matter. Anyway, since we have ben overseas we have successfully negotiated full and final settlement with MBNA (RMA) and Egg (ARC Europe Ltd).
We have one more credit card debt with barclaycard which we were hoping to negotiate in next few months. The reason we have them at the end was because every now and then barclaycard will take out £170-200 from her Barclays account. The total debt is around £7700 and a default has already ben placed in her credit file since early 2010. YEsterday "Apex Credit Management" people called at her work place, i dont know how did they trace her number down as we live in an Asian country now and left her colleague a message to contact them. We contacted them twice yesterday. They took our details and promised to call us back within couple of minutes. We however, did not receive any calls from them to which i dont understand the reason. Can someone please let me know what would be the right course of action in this situation. Should i approach barclaycard directly or send them a full and final settlement offer or wait to hear back from Apex. Also if someone has dealt with them before regarding full and final settlement? How understanding and co-operative they are in this regard?
Thanks in Advance,
Bowden