Cell C contract bad customer service

Good day I would like to log complain regarding cell C contract. Cell C it keeps debting double the amount every month and they keep saying is not reflecting from their side. I went to the nearest store they said I must call and send an email I did no respond. I call them the keep on ending my calls without conclusion, but I they just run away when I request reference number the end the call last consultant I spoke to Dipuo. she refused to help me and her email address is not working. I did ask Dipuo to escalate the issue and then she refuse also. I do have 2 live the agreement was R450 and now they debt more every month it keeps on increasing. October monthly amount was R544 and now is R615, this month they did double the amount. Cell C customer service it's very bad I rate them 0,0 %. I'm not happy they treated us like we do add value to their service provider. I've send the bank statements several times with no response and being assisted. they just keep on debating any day they like to debt. Kindly attend my complain.