I want to upgrade on my MTN contract

<p>I went to upgrade my phone at the MTN store, They told me they can’t help me with a IPHONE 6 Plus because they got no stock left.</p> <p>After 17 days now I still have no response, the only answer I get is that MTN can’t tell me when the phone will be delivered at the store because of SECURITY REASONS????</p> <p> </p> <p>After 8 years, I Think it is time to move to another network.</p>