Poor service/ failing to provide certificates

I completed Wealth Management NQF5 with Trainsure in October 2022, but I haven't received my certificate. The institution claims that the issue lies with the INSETA system, as they are unable to upload certificates. I've attempted to call INSETA several times, but the number doesn't connect. When they do answer, they abruptly hang up the phone. The number I've been trying since the beginning of the week is 0113818900.