8TA can't produce me what they advertise

i have been approved for a laptop contract and the mi-fi router. 8ta Middelburg mall had no stock and had to order one. Its been 8 working days since my approval and i have been there 4 time just excuses every time. My work is dependant on a laptop i need it urgently and they don't want to give me it alone but just as a package. Why do they advertise something they can't give me. The person that helped me the second was supposed to phone me on the 21st of December he did not even bother and he promised to phone me. They have to swap out stock with another branch but this looks like nobody want to swop them a MI-FI router and i wonder why. The manager was not there to sort this out she knocks off at 17:00 and 8ta closes at 18:00. This has been the worst service from 8TA ever. I feel like cancelling all my contracts with 8ta. i emailed the customer complaints and they say i must go and see the manager. So i have to leave work early to see the manager to suit her conveniently and she will tell me the same story. Please this is a matter of urgency.