MTN terrible Service

I'm trying to upgrade but nobody has stock of what I'm looking for. I cant understand as it is in your new brochure for December. Online is a useless site as there is only about 8 devices and only 1 laptop. I visited your n1 city branch and I was told they have one unit of the device I'm looking for but it is a set aside for a customer. The consultant said he will follow up with the customer to see if they still taking it and call me back. I'm still waiting for that call. I have also called the branch about 15 times and nobody answers. I'm extremely disappointed at the customer service of MTN. I would appreciate it someone could assist me. I even logged a query for online and still have not got a response. Surely this is not the customer service you offer your customers.