Shredded ID book

On the 08/04/2015 I did 2 upgrades of which my ID book was not returned to me & I asked the consultant & he said that he gave me all my docs. On 09/04/2015 I received a call from the consultant where he confirmed that he forgot to return my id book to me. I arranged to have it collected by the 11/04/2015 & when my friend went to collect it as arranged, it was said that there are no ID's in the store. The consultant was on leave at this time but he assured me that his colleagues were aware of it. I then contacted the number stipulated on my contract but no answer., After a week of trying I called the switch board and a lady emailed my request through to management at the store and included the consultant ....nothing came of it. The following week I once again called in where the lady @ switchboard sent a 2nd request to management regarding my concerns. 2 days after that I received a call from the consultant informing me that management has SHREDDED my ID !!! logged a complaint via email with customer care & got a ref # on 21/04/2015 but nothing since then. What gives MTN the right to shred my ID book and tell me that I shouldn't worry as I'm not the only one this was done to !!