Terribly poor service from Samsung support

I tried to purchase a theme on the Samsung app store. I have tried using Samsung Pay and loaded 2 different bank cards. I'm getting ***** error messages on all of them. I have called my bank they say their is no issue on the banks side and that the Samsung app is creating the rejection. I phoned on Tuesday morning ref no: *** and was told that a senior consultant would give me a call back. That was on Tuesday morning at 8.30am. I'M STILL WAITING!!!! No callback it's now Thursday!! I chatted to Sindiswa at 15.51 that day on whatsapp and complained that I hadnt received a call back. She apologised and said you were experiencing high call volumes and put through another request. I then called Boitumelo in Samsung Pay department and complained about my issue she said she needed to consult with her manager and promised me a callback at 11 yesterday morning. I have not heard from her either. I am FUMING this is not the kind of service I expect for my Samsung S25 Ultra. Currently I'm unable to buy anything off the Samsung app. The service I'm receiving is incredibly poor, in fact non existent. I'm very unimpressed and frustrated. I have this lovely new device and would like to customise it and cannot die to this problem.