Change time on a movie ticket

I made a mistake booking the wrong time on my online booking i sent an e-mail to ********** at 07h35 am on 11 May 2018 to make an amendment no one got back to me, just before 17h00 i sent another request to attend to change the time. its Monday 14 May and still no one has contacted me so I call customer service they told me i made the booking on their new system and the only way they could help me is to do a comp ticket that i would now need to to pay an extra R7 odd on my credit card which is not possible as my account transaction min R25. so they then tell me the only other option is to do a refund thats going to take 7 - 14 working days. I am furious that as a customer I have to pay an extra amount that will not go off my account as its to small of an amount and that i dont have any other options to make a change. the service i received was shocking in regards to getting this sorted out. so i opted for the refund the lady gave my the ********** e-mail where i am not getting much response from and told me i must put my banking details on the e-mail which i find really odd so i told her im not disclosing my banking details that way until someone actually contacts me from that division she then advised me thats the only way i was going to get me refund this sounds very dodge. So on that note I will never use ster-kinekor again. Service is shocking and no one gets back to me