Handed over to Debt Collectors after they failed to send me an Invoice for Payment!

I was very surprised to receive a call from Colmed Debt Collectors (Aug 2020) that I have failed to pay for Xrays that was done Life Hospital Emalahleni (Sept 2019). They have even sent me a statement of R910 (almost R300 in collection fee's)! I have asked them that Van Rensburg should send me all correspondence, emails, calls, sms, post ect to proof that they sent me a statement to pay. Well......... I am still waiting. I will refuse to pay the collection fee's