Online banking blocked 3 times and have to spend lot of money to unblock

I am really disappointed in ABSA, because they blocked my online payment services 3 times now and every time I have to call them and explain to them I am not in the country and I am using my card to make payments online, it is very expensive to make calls from out side the country to South Africa and every time I need to buy at least R500 airtime just to complete a call with them. It is extremely expensive and frustrating, today I am sitting with the same issue because I need to do a payment and I am not able to do so, they do not even check with me if it is me who is making the transaction nor do they check with me if I am they notify me when they block my account, I just find out it is blocked when I need to make a transaction. This is very inconvenient because sometimes I need to make a transaction fast and then I must first take out and put my South African sim in then I need to make sure there is at least R500 airtime on that sim, then I struggle to get through to them to unblock my account. Ps. My account is still blocked for online transactions and I do not want to spend another R500 on airtime.