Data sim card contract not working on mobile router

I have purchased a data sim card only for mobile router in January 2023 at Menlyn Vodacom shop. During that time I want not advised by the store manager, which mobile router I should connect the sim card. Luckily the sim card worked with mobile router until September 2023 when I lost the mobile router. I got a sim swap for the data sim card only however the sim card does not connect to mobile router anywhere. After contacting vodacom customer care and vodacom menlyn shop, I have been told that there is nothing they can do as now the sim card only works on home router. Now I am paying for sim card only contract which i can not use on mobile router. I have also escalated this to ICASA.