Yoco not taking resposibility

i bought a yoco card reader a while ago with the plan to buy one of POSlab touchscreen android pos devices. the POS device meets all system requirements that yoco highlighted on their website, however i installed the yoco app on the android device but when i tried to open it then it just crushed with an error message that " yoco unfortunately crushed" we spoke to the support team and even escalated this issue to the developers and they said they can fix it and one of their old versions 1.0.12 should work and they will send it to POSLab dev them and we can asking for it calling them and then they out of nowhere they just come back to say their app is only designed to work on mobile devices and they can't help anymore. The PosLab system i bought is a tablet integrated to other hardware, android 4.2.2 worked fine and other apps worked fine but yoco don't want to fix the problem and help their customers. what i think is that because they have their own POS system they working on now they don't want to help us so we can buy their unavailable system meaning we have to wait until they are ready to have proper systems, this is truly unacceptable as a customer that bought their product and they don't want to help. i dealt with Anele Dyan but he just left me hanging