REFUND ******

I went to Post Office in Grand Central, Cape Town on Thursday the 05 May 2016 at around 9am to send a parcel through ordinary mail and paid R44.50 or so and got Tracing No: PE 884 894 466 ZA and left the post office. About 15min later i called the recipient who confirmed that post office in rustenburg will be too far and she would prefer door delivery... I then called the Customer care no and was informed it can be changed. Same time I went to the post office again and foortunately got the same lady that assisted me. I explained the scenario to her and the parcel was still in her counter. She changed it for me at a cost of R140.67 to the courier with tracking no: TA 769 925 305 ZA... The issue now was the fact that I was then informed the System doesn't allow for the refund of the 1st transaction which by the way I paid for and ddnt utilize. Mind you I was not even asked to add the balance on top of it to make total due. I had to pay a separate R140.67 on top of the initital R44.50 which was not gonna be refunded. The consultant agreed with me as well that the refund is due to me but cannot be done. I feel that is day light ******* and if that's how post office operates then they might as well shut down. They force me to pay for a service not utilized.... On top of that I was promised that they will keep checking during the day and I will be informed and until now I have received no call from them