Telkom and their half information

Telkom mobile sucks! I went on the 24 of April to re-new my contract. The one I wanted was the free me contract that has 100 free minutes. I told the lady that was helping me and wanted a P20 lite. She assured me that I will get the same on the P20 lite. So I took it. Saturday I realize I can't make any calls only to find that my contract doesn't come with the 100 minutes as she previously said, I was told it's extra.

Now to add more salt to the injury I check my statement I am charged the full device amount from the 1st of April even though I received the device only on the 24th. Why do you not disclose the whole information at your customers? I fell like I'm getting a raw deal, why am I being charged for all the other days that I didn't have the device why theen didn't you tell me this when I came and advice me to come only when the month ends?