Where is My Data and Airtime?

1).I bought 1 GB worth of data after the 22nd of December 2015 which automatically becomes a 2 GB, the data is due to expire in a months time if it is not used. I added someone to share the data with because i knew there was no way i was going to finish the data before it expires. i was quiet happy with the rate the data was being used. until this morning the 7th January 2016, last night when i checked my data i had 1, 4 GB worth of data i wake up this morning with all application closed i have 53 KB data left <br> <br> This does not make sense i contacted the call center of which i was sent from pillar to post. I then got hold of the lady by the name Lerato who could not assist me then sent me to someone who also could not help, then sent me to a lady by the surname De Koek if am not mistaken she was able to tell me the times data was used but it still does not add as to where my data went<br> <br> 2).yesterday when i inquired about something i was told to dial 1555 its free but i was not told about the 083 i was charged for the call.<br> <br> 3).This morning again my airtime disappeared i loaded airtime they say i have no airtime, MTN where is my Data & airtime its about time i change my network