Bad service

I was requested to send documents to them. I sent via email, via provided whatsapp number and via thier online portal. For nearly three weeks they send me remainders requesting the same documents. I have called customer service three times, each time I received a different story. One lady took my details and said she would call me back because the system was slow, and she couldn't check my query, she never called back.

I have emailed them, filled query forms. No response at all. I am tired of the run around, I do understand how so many departments can fail to do such a simple thing.