Data ****** and *********** call centre agents

I bought the night time express data for 250mb for early hours of 20/02/2016. Around 00h02 I logged into instagram on my mobile and then I logged off in about 6 mins. Just as I was about to start browsing the internet, I decide to check my balance and realised that the 250mb of data had literally vanished in 8 minutes. I have been using my device and my instagram for months now and honestly I have never experienced this. I then decided to call the call centre and ooooh my, I have been waiting in the queue for the past 46 mins now. Where on earth are the agents as acccording to my understanding MTN call centre is 24 hours operational. How on earth must we carry on using this network when you can't even depend on them at odd hours of the night. I am disappointed and very angry with MTN as I have been a loyal customer for the past 12 years. MTN I want my data back and I want it back now. This is ****************. Give me back my data NOOOW and tell your *********** agents to stop sleeping on the job.