poor customer service and no delivery of goods

terrible experience from this shop, i dont understand if you lay-bye something dont they put it aside and once you settle the bill then get it delivered.so i settled my bill 1st of August and sent an email to SAS****** to confirm payment and delivery , i was told they will deliver between 2-5 working days, i waited on day 9 i called at 9am for follow up i was told they will check for me what happened to my delivery later on sent an email no response, i called again and they guy by the name of Anthony said he will check and call me back , and he called and told me they dont have stock they will only have stock september , i am so dissapointed was hoping to recieve the car before september for my sons birthday. This is pathetic and very dissapointed.cause now i am told i must take the Evoque and Audi and i bought the mercedes, im dissapointed serious.