UIF cannot sort out bank account to pay contributions

After being able to pay my UIF contributions from the UIF website, some time ago the website refused to allow me to pay, citing some issue with my bank account. Multiple attempts by calling their call centre and emailing them, have not resulted in the matter being resolved. In this process, I have never been contacted by them in order to help resolve the issue. One would think they would be keen to help me to pay them.