Rain disgusting service

exceptionally bad service. At the start of lock down they were eager to send my dim card so that I could be connected to the internet. After doing to online RICA I was then told that there was either something wrong with my card or the router, since the router was working with another sim I tried to explain to them that they needed to replace the Sim card. After many emails back and foreword I eventually gave up with this useless service provider. And after an email to state "no hard feelings" and that my sim had been canceled. I got charged for yet another month at the beginning of July. I sent more emails proving that this sim had been canceled and yet lo and behold they had charged my account for this canceled sim. They promised me a refund within 10 working days, it is now the 23rd July 2020, 20 calendar days later with still no refund.