False information and ripping customers off

There's a competition played by Mtn , that's called Spin'n Win. On the 31st of January I purchased weekly 50Mb bundle and got free spins on their competition. I then played Mtn Spin'n Win and won another 50Mb and received a confirmation SMS that reads "Y'ello! Congratulations on winning 50MB Data via Spin 'n Win valid until ********** 1" but when I woke up on the 1st of Feb my another 50Mb that I've won dissapeared. I then called Mtn at 12:00 on their 173 toll free number and spoke to Sinqobile to asked what happened to the other 50Mb bundle, then she told me that she will log a complaint on her side I must call back after 2 hours to see how it went. I called after 2 hours which was 14:30 and spoke to the lady called Nondumiso Khoza and asked her how far is my complaint investigation and she told me my data bundle expired at around 3 am... Then I asked why is it like that because the confirmation SMS I got said that my data was valid till the 1st of Feb and surprisingly it was still the 1st and the was no time frame coz the day ends at 23:59 of which I was not in a hurry to use my data because I know I have the whole day. I then asked her to transfer me to her supervisor as she was unaware to answer my other questions. Then they guy by the name of Luganda Hlophe told me the same thing that it expired at 03:00am of which I've never heard in any historical news that a day ends at 03:00am in the morning while we all still slepping of which I don't have a problem with but it wasn't stated on the confirmation SMS and nothing like that stated on the competition T&Cs and he was also not sure of their competition T&Cs of which made me realise that MTN is ripping us off according to CPA . I've won that data bundle and I wanted to use it as it was still the 1st and nothing stated that it won't last till 23:59. Then the guy promised to log a complaint and he will get back to me, 24 hr passed, 48 hr passed, a week ended, its towards the end of the second week and I haven't received any use of communication from MTN I don't know whether they think I forgot or embarrassed that they indeed riping off their customers. They might as well end this stupid competition or take their stuff for further training on the competition and stop ripping their customer off.