Unhappy with your service guys

I have a complaint. Been calling rain since 17 December 2023. The one sim card cant make calls so basically the minutes must be reimbused as soon as they resolve. I am billed R859 with no explanation. I called and no one ever responds. I need someone to come and explain and correct all of this. The team was so helpfull when I subscribed but now they are all knowhere to be found. Rain please contact your business. You are a service provider you all cant go on december holiday. please contact me urgently. I have sent call back requests, emails and called to this day nothing.