Waiting 7 Months for a so called Spare Key

Bought a Merc B180 on the 21st of December From Mastercar Lindsay Saker Rivonia. I inquired about a spare key & was ensured that there is one,i can pick it up later the week. No avail .One month after the cash purchase i receive the parcel with NATIS and so called key...No Key.After so many emails and correspondence - i informed them according to MB Rustenburg my car has to stay at dealer to order key and they should provide me with a rental. I was informed key was then ordered from Sandton, sent copies of NATIS , ID, Consent Letter - weeks later still no key. My husband then phoned, and informed that we need the spare key. I was informed that the courier will send it the same day. One and a half weeks later , still no key. On the 20th we phoned the manager of sales executive who had a no care attitude and informed us the sales rep stays responsible.Then phoned is manager - who who was keen to help. A driver was sent with an incorrect spare key. I was then promised a new key will be sent to our branch on Friday.., Monday = Loads of new stories and very bad attitudes. This is the Lindsay saker / mastercar way of doing business!! Very good sales assistance , terrible after sales!