Cell SEE FOR MYSELF

I have 3 contracts with Cell C, recently changed my banking details and informed cell C, however they continued to debit from an old account which is now inactive and obviously without any funds, about 2 weeks ago, they suspended services, i called to make payment arrangements however they told me that the account number I'm giving them appears to be incorrect on their system and I'll have to make transfer, they promised to sms me the banking details and I've been waiting ever since... Please help