Capitec double transactions

I'm having a huge problem with Capitec at the moment. I am currently working overseas and mostly use my debit card to swipe for purchases as well as buying flights online etc as it saves loads of bank cost, for the 3rd time in the last month Capitec has taken of transactions twice for the same amount which has led to sometimes not having access to my account which is a big problem being overseas as i then have no funds available as i don't always use cash. I send multiple emails i even get family in South africa to send multiple emails and every time it takes forever for them to reply and sort out this issue and to actually reverse the payment which i find absolutely ridiculous as after the first time the problem haven't been sorted out and it keeps happening. I don't know what to do anymore as now I'm stuck once again with no access to my account with yet another transaction that has taken a huge amount out of my account for flights that i bought a week ago. I need urgent help to PERMANENTLY resolve this issue.