upgrade issues

On wednesday the 12th of october 2017,i phoned the mtn call centre and moved on to the upgrade option.i was looking for a lenovo laptop,i was told that the item did not show on their system and that the system was slow,however,the spesified item was advertised in the october 2017 brochure.The next day on the 13th i phoned in again,again i was told that the system was slow,this time around i was told that they are not sure if they actually have stock,but since the system was so slow,i was told that i will be phoned back with the answer.i hung up and started the waiting.i waited untill 5 that afternoon and still nothing.now i wonder,is this mtn telling me to rather cancel the contract and move on or what?By the way,all my calls are recorded on my phone as well,so i can prove what i am claiming.