FIX MY ACCOUNT MTN!

Account number: A ********** My bill has been R801 and any cents since the start of my contract. Then in December 2018 I paid R695.63, which I thought was weird, but in January 2019 I paid R1004.03 so I thought okay now the two cancelled each other out. Then in February 2019 I again paid R1004.02. At this point I was still overseas working in Korea (since June 2018 - and no I was NOT using my MTN simcard at this point - I had a Korean simcard). So then I contacted Chrystal Booysen at MTN Vredendal and she said she'll look into it. Then at the beginning of March I got a text from MTN saying my February bill was now over R2000! I again asked Chrystal what is going on with my account, and she asked me if I was using roaming, and I told her that I only landed in Cape Town on the 2nd of March and only then started using my MTN simcard so how can they charge me for roaming in February? My sim card was with me the entire time so no one else could have used it either. She said she would sort it out and she got it down to R1157.79. I told her that this still wasn't right and she said she'll sort it out. Well now yesterday I paid the R1157.79 and nothing has been sorted out. Can you PLEASE sort out my account! I cannot pay this much for a phone that I pay R800 for! FIX IT PLEASE!