Worst worst experience ever *******!!!!

It's been 3 weeks of calling everyday and still no one has even attempted to give me a call back I was overcharged and my WiFi was put off and now I can't get my refund literally the most *********** staff I have ever dealt with everyone is working from home so if they can't help you no one can no support at all. Can somebody please what legal action I can take against them. My nmr is *** and my email ***