BEEN HANDED OVER BUT NOT MY NUMBERS

Please can someone assist me, tried calling Debt collectors (MBDS ***) but just rings. Tried calling Vodacom but can never get hold of someone that can assist me or send me a copy of my contract. Don't have a business account - account number ***. This is urgent as I keep receiving demands but have no detailed account. Please contact me on *** urgently as I would like this resolved ASAP