Problem still not resolved

Following my last complaint of data bundles depleting incorrectly, MTN offered a refund for the lost bundles and the refund was a good start but this did not fix the root cause of the problem plus the previous month bundles disappeared mid month when I processed a contract upgrade, yet these bundles were part of an existing agreement which should be honored. Now a new month has come and again I'm experiencing the same problems where purchased bundles are depleting prior to the bonus data.