Poor service - Vodacom 4 U Secunda

I am very disappointed with the service provided by Vodacom 4U shop in Secunda mall. I have an existing 24month data contract which is due for an upgrade. On the 1st attempt to upgrade my contract during promotional data rates (a package which was chosen in store) I was informed that I would be contacted for the conclusion of the deal once the Wifi router has arrived. I however received no communication. I personally followed up with a visit to the shop after a month only to be informed that the order was never completed and that the promotion has since expired and the deal cannot be concluded. I was then promised by the same individual to be informed as soon a the original promosion was offered again in order to conclude a new deal. This again did not happen. Upon visiting the store for the 3rd time I was informed that the promotion was on offer again but has expired on the 6th of May. My main reason for concern is that empty commitments are made by the staff of the store which are not followed through or committed to. This results in a loss of faith in the authenticity of a business.