****med 5GB Because I'm on trail

I am very disappointed 😞 with 5GB ends within days, when I contact support Benn sends me a report where default used much data, when I asked what is default he says I might have been updating my phone , I told him that I use wifi when updating, he then said I can see it was used. Not sure if this is because Im on trail, but I'm now doubting the Melon Mobile especially with the support agent who are not so supportive, I wouldn't have used 5GB in 2 days I feel ****med at this point