Potential ***** on Account not resoved for 3 years

I suspect that someone committed ***** on my account while I lived in Australia for a period of 3 years (the store card was with me in Australia during the time the purchases were made). I have been trying to resolve the matter since May 2012 through MBD Credit Solutions and by going into the Cresta and Rosebank branches more than FIFTEEN (15) times. The branches can't tell me how much is owed on the account yet I have been blacklisted? The call center (CPT) keeps telling me that it is being investigated and that they will get back to me (this never happens), I have given my contact details to more than 15 consultants. I have also completed a dispute form twice and sent email correspondence to MBD Credit Solutions with no response. I can afford to pay the total outstanding amount (credit limit on account is very low) but I do not want to pay it until the suspect purchases have been investigated. A bad credit record has a multitude of adverse consequences for me both from a personal and career perspective and I need it to be resolved ASAP and I require assistance from Woolworths to do so. I do not want to get lawyers involved due to the small amount in dispute (cost versus benefit).