I'm a bit disappointed

I do like rain I've been using it for the past 2 years Even though there we moments where I was not satisfied but for the most part I'm enjoying the service I think they do lack a bit on customer service

Here's my problem so I'm using 5G network and have been using it for almost 5 months and haven't had problems until recently I wanted to change my billing date from 25th to 1st and i did that just a week before I had to pay for July usage and I was only doing that because I was gonna receive my money days after the 25th so I did it so that Capitec doesn't make declined transaction fees Instead what happened is that I was billed on the 28th of July just hours after I received my money

I was okay with that because it had to be done but then on the 1st of August my account told me that I had to pay which I already did so I didn't understand why are they charging me twice

I emailed them to asked what's going till today I still haven't received a proper answer or assistance to get back account working again, I'm really starting to get angry because I'm a student and that R500 is what I only had so please if anyone from rain sees this Please assist me because I can't afford to pay twice