Trying to call but being told number is invalid!!

I've been disputing billing issues with MTN for the past 3 months. Now all I want is to get someone to send me an updated statement so I can make payment but whenever I can I get asked to put in my number and am then told by the automatic response system that my number is invalid and provided with no alternative options to speak to a representative. My account number is A***. Can someone please provide me with a statement or call me. This is extremely annoying as all I want is to settle this now.