No payment received for service delivered

I was asked to do a bee removal at Southdowns Shopping Centre in Centurion as it was urgent. I completed all the necessary forms as it is a once-off service needed as an outside contractor. I tried various times to follow up on the payment and was told that it "should have been paid by now". No payment has been received for two months now. When you phone them, they transfer you and then you listen to the message which says "we are constantly delivering beyond expectation" and something like '"we are distinguished by our service excellence". Really? They do not answer the phone when transferred.