Extreme overcharge for internet cost (200+)

Hello,

I am writing this in complete shock and upset and I am requesting help to resolve the issue. I received a text message whilst I was out that my data had been used up, following this I set my phone to airplane mode immediately.

Once I was back on Wifi, I turned airplane mode off but kept my data off as well, when I received a message that my sim had been blocked for sudden high charges. I logged on to Simyo to see that 210 EUR have been charge to my account. I am absolutely shocked as I acted immediately to turn off the data to avoid any extra costs. Not only this, but I had previously had a cost limit set on my simcard which seems to have been removed. I have now put this back into place.

Please can I have some help to waiver or reimburse the costs somehow, as well as to unblock my Sim which is only able to be done after paying 100EUR currently. These costs are far too high, and my bills have never exceeded 60 EUR, even with internet use outside of my bundle. I have been a Simyo customer for over 2 years and have never missed a payment, and I am really shaken by this experience. I am not able to meet these extreme costs which pose an extreme financial burden. I have read that there is a delay between when the data warning text is sent and the actual data usage, and I really feel I have been trapped by this.

Thank you in advance for the help.