Poor Customer Service

I complained on the 15th of July 2020 about being billed for a SIM that I cancelled in advance, but still got billed the full amount even though it was not used for the entire month. It's a week later and I still did not receive any feedback from Rain. It was only a reply from Fattima to say a consultant will contact me. And that is it. What do I need to do so that someone from Rain will get in touch with me