Bad customer service NISSAN SOUTH AFRICA

We have a Nissan Xtrail.It was in an accident and about 7 parts was needed from the radiator to brackets for the bumper and a bonnet.The parts was ordered by the panelbeater on the 2nd of November .Most parts were only received by the Monday the 20th.By Friday the 24th they still needed to supply a part with NO DE*****Y DATE.I spoke to their call centre people and complained and asked for a rental car as it has now been 3 weeks and still the parts are still on order.They just said no.I could not speak to anybody but a call centre supervisor who is not senior enough to deal with such a request.I was not given a managers name to take it further.It is such bad service because the panel beater phoned many a time with no delivery of parts.After 3 weeks I complained and then some parts arrived.They did not even give me an e mail adress to put my complaint in writing other than there stupid call centre mailbox.You phone and leave messages no one phones back.When you phone at 4 everyone has left.Bad Bad Bad service.Will never buy a Nissan again and make sure I cost them sakes with bad referrals.