OVER CHARGED FOR A SERVICE THAT WAS IMPOSSIBLE TO PERFORM

On Wednesday the 6th of December I went to Postnet in Springs Mall,Gauteng desperate for a parcel to get to Umtata asap. When I arrived there I was told about 2 services, 1 that was R99 which would take 2-3 days and an overnight counter to door which cost R245. In my desperation, I opted for the 2nd option. The gentleman informed me that because it was after 1pm the parcel would not get in Umtata the next day but only on Fri, I was ok with that and understood. Sadly that did not happen, on Monday morning I called postnet and only then they advised me that Umtata was an outline area and that it would take up to 5 DAYS! They also told me that it is not their fault but that of Aramex because they work with the company! Not understanding why I was told that information because frankly what happens at the back office is none of my business. I was a customer who paid for the service at POSTNET NOT ARAMEX and therefore Post net is responsible. The parcel only arrived on Tuesday the 12th at 11:21. I am very disappointed by the service and attitude I received from this branch and I would like a refund for this because I did not receive the service I paid for. The sad part about this is that I had an other parcel on that same day which I paid R99 for because it was not that urgent. I believe I should get R145 back and only be charged R99. Why do they offer this service to outline towns knowing very well that it can not happen? Please assist me with this matter because I have had enough of their rude attitude and stinking service