Telkom trying to **** me again this time with VVM collection.. I don't even know what it stands for

Telkom Mobile account has been handed over to VVM for the collection of an amount of R581.51. It is in your best interest to contact us for a flexible payment arrangement. WhatsApp ***, reply to this message for us to phone you back or call us on *** ***

Again Telkom comes back again with a different collector's with waaay less amount from the previous years, I never payed what's decreasing it. I will not pay for a ***** committed by telkom personnel