Erroneous debt review

I discovered on 27 May 2015 that my standard bank cheque account had been stopped, upon further investigation I discovered my account was placed under debt review for an unpaid overdraft. I never authorised the overdraft, never spent it and never app**** for debt review. upon further investigation it was discovered there is not paper trail for any of the above! 10 days later I still cannot access my money even though the stop has been lifted by 3 different people from 3 different departments...