MTN unfair treatment

I app**** for a contract phone at MTN in Ghandi Square Johannesburg cbd the package they gave me wasn't fully explained all that was said is the amount of airtime and data I will receive, on the 11/12/2018 at 00:00 I received my first load of airtime being R110 I used it in the morning spoke to my daughter for 20 seconds and R30. 00 was gone same thing later on that day I made another call under 1 minute and most of it was gone only to find out the airtime I got was in rand value and not as Ani time minutes I went to the nearest MTN shop in Jabulani mall they told me to go to the same shop I got the phone so I went yesterday to Ghandi Square the consultant "sanele" was very rude he told me they cannot change the package as I must wait for three months then he said we were supposed to report the matter within 7 days of recieving the phone how would I have reported the matter when they hadn't loaded their airtime? I only experienced the problem after the 7 days I only found out about yesterday, I have been an MTN customer for more than 20 years I do not appreciate such treatment dealing with rude none informative people.