My car has been with the dealer ready for delivery...

My car has been with the dealer ready for delivery for three weeks now have rang Tusker twice in two weeks who promise to get back to me by the end of the day on both occasions, , and yes you've guessed it no contact , all i get is excuse after excuse, the systems are down , or theres another issue ,i can forgive tech issues but failing to return a call when promised is unforgivable , as someone who works in that area i think the customer service is disgusting and will definitely be bringing it to the attention of my employer as to why they use this car leasing company. Rant over.