MTN needs to refund us!

Loaded BIS on Tuesday, amount deducted from my airtime balance but BIS did not activate. Call centre left unanswered. Eventually getting through 24 hours later, BIS activated for 3 hours and went off again until sometime during the night when it came back on. It has now been off again for 2 hours. MTN must refund my BIS or alternatively extend this months' subscription. No one knows when the problem will be resolved. Sick and tired of this no care attitude!