Vodacom

I have been with Vodacom for over 30 years - lately their communications have not been the best. I have had deliveries that have never arrived due to been sent to the incorrect address - Given a street address without a postal code is a no brainer as they need a postal code to clarify the suburb - I fail to get this through to Vodacom. I may be wrong in my assumption as it may be the Couriers that have messed up but I would imagine that they are fed the necessary info from Vodacom - CONFUSED- please advise if I am over reacting