I wanted to borrow a...

I wanted to borrow airtime on the Mtn app so I can buy data because I had a project I need to do with the data, so while I was on the Mtn app I decided to borrow data instead of airtime then I saw 3G weekly bundle so I decided to borrow it knowing that I will push me at least 7 days.. After borrowing the data I used it for some couple minutes and I slept and around 09:00 in the morning I tried to use the data but my phone couldn't connect and when I checked my balance I found out that the data is gone and I contact MTN customer service they told me that the data was for and hour but on their app it showed weekly.. I emailed customer care@mtn to complain about the issue they asked me to sent the message I did but they never came back to me..