Rain made me pay for a service I was told would be automatically cancelled

I have been using Rain since 2020 and I never had problems. My problem started when I went from using their 4G service to their 5G. When I asked I was told by their consultant that my 4G service would automatically be cancelled as soon as My 5G was activated. Three months down the line I found out was true. I found myself having to pay for both services for three whole months. When I call them and tell them what happened they tell me they will escalate and they never get back to me. I am tired of calling and getting no assistance so I have cancelled my subscription altogether. All I want is the money I wasted for three months on a service I was told would be cancelled. I had no choice but to pay over R2000 more than I should just to stay connected since I work from home and my son is home-schooled. I just want my money back .