Application approved - then suddenly declined

So I phoned Telkom to apply for the 10Gig + 10Gig Promo which is running for the month of August. Spoke with Roxanne in the sales department whom advised that I have been approved and that I will receive my order via delivery within 7 - 14 days. After spending a significant amount of my time giving her all my details she needed for the new contract she advised me that I can cancel my current month to month 5gig + 5gig promo (seeing that I have been approved)... After not receiving any confirmation via email or sms to confirm my order, I got suspicious and phoned the sales department again to follow up (spoke with Michelle), just to find out that I have all of sudden been declined... How is this even possible??? A contract of R199 per month and I am declined??! Not at all possible!! This is very poor service, Telkom did not even advise me of this, I had to contact them myself! I would like this matter to be investigated as something is not adding up. Out of stock maybe? Or perhaps you have reached your number of sales on this item, whatever the reason, I don't care. This is pathetic!