No technical assistance for internet banking problems

For the last 2 days, I have been trying to settle my loan account with Capitec. I was advised by the branch that this can be online. I have tried making payment via the app and via internet banking on my browser. Regardless of what I do, I cannot process the payment. I can make payments to other beneficiaries, but not to my loan account. I phoned client care and was transferred to 3 different departments and no one can help me. Everytime I try and make payment I get a "server error - if this continues phone ***". No one that I have spoken to is able to help!! What is the point of internet banking if there is no technical support. Now, I am being charged interest daily on a loan that Capitec's system won't allow me to settle. If this is not resolved within the next 48 hours, I will be closing my account with Capitec and move to a bank that can help you when you need assistance. this is pathetic.