Clay Telecom — Bad experience using that clay sim card

I was travelling to Germany and opted for a Clay sim card and let me tell you it was a bad experience using that clay sim card. My phone stopped working after a day and when i contacted their customer care, they simply said i have exceeded my bill limit and disconnected. How is it practically possible to exceed the limit of Rs 10000/- in one day !!! Not only did they mess up my bill but also wasted 4 days of follow up to get it corrected. Clay is a horrible company to deal with.