BAD SERVICE !

Good day, on Monday I went to Toy Kingdom in tygervalley as i wanted to purchase two superhero dolls. Unfortunately they only had stock of the wonder woman doll but not the Black widow doll. The assistant advised me that it would be best to order the items from their only store as that was the only branch that had stock of both dolls. I immediately placed the order for the deals as I urgently need them for a cake. Yesterday morning someone called from the online store advising that they infact dont have stock of the Wonder woman doll and that they can give me a voucher or refund me. I requested that she arrange with the Tygervalley branch that i collect the Wonder woman doll from them as i work close by. She said she would call me back. She still hasnt called. I proceeded to send an email to the cusomer care contact and the agent said i need to pay the difference in price as the doll is more expensive in store. Now firstly, i was okay with buying it online and paying for delivery because i would be getting both dolls. Now they are telling me that i in fact paid almost R130 for one doll which i would have never done had there only been 1 doll available online. Secondly , WHOSE FAULT IS IT THAT THE DOLL WAS AVAILABLE ONLINE ! Not mine. Where is the client centricity in this? It is not fair to make me pay the difference. Why can i not be accommodated since the error was on your side ? Im annoyed and frustrated. I will NEVER buy anything from your store again. I get that mistakes happen but the after serivce is a little pathetic for a high end store.