Migration - NO Caller ID

When my contract number / service EVENTUALLY was migrated from Contract ( been with MTN for 20years ) and still have 5 contracts with them and spending Thousands a month, my Caller ID showing No Caller ID. We have spoken to the Contracts DEPT. and they saying it's Pre Paid Dept. Then after holding for 23min eventually got through to Pay as U GO Dept. they told us it's the Contracts Dept. Then even after sending 12 mails to the BU Call Centre and Ngokwana Manthata, who handles the request I still haven't got any answer from them. Still NO caller ID. Still no reply on all our mails. And this B/**** on the same network!!!