Bullies and ****

I took my phone to repairs since it had a sensor issue 3 months ago. I still could make calls and use normal. But because it was still under warranty I took it to repairs. I received sms that they are still waiting for spares, so I assumed that they will fix it. Later after 2 weeks I received a call from them, now I have to pay for this repairs, I went to the shop Anna claimed to be the manager, she refused that I speak to the store manager. She said he was in a long call. They are over charging for this phone but it was still under warranty when I took it to them. Please assist I do want to deal with Annah maruma or Werner Kruger. I have prove of everything