BAD CUSTOMER SERVICE FOR UPGRADE

i went to the MTN K90 Boksburg store to upgrade my phone on the 22nd September they never had my phone or the watch in stock, i went back the 28th September, it was still not in stock on the 29th they phoned and said they have received stock, they quoted me on a package of R600 for the phone and watch i accepted the quote, i then went on the 30th to get the phone, but they had not power or a generator, so they could not assist me, i went back today the 5th October to be told they cannot give me that package anymore as its October and not September. i expalined that this is not my problem as i have been there and they could not assist, the manager of the store did not even come to speak to us, i would like to know what is MTN going to do as this is poor cusotmer service and i want the phone and watch that i was quoted on in September, it is not my fault that the store could assist me when i went to collect it. VERY BAD CUSTOMER SERVICE, i would like feedback please