Bad customer service

Terrible customer service from 2 agents who were very rude and impatient for no reason. I called with an enquiry about my existing loan, in order to amend the dates, so I don't miss repayments. I explained why and the call cut off without them getting back to me with the proper information that I need. I was told to submit a payslip with no information about where I need to send it. The link they even send via sms doesn't even work. They need to hire better call service agents who know what they are doing and can follow up because I don't like what they did.