I put a hotspot for my wife who is pregnant and had a long day after we moved into a new apartment to watch something and relax this evening and left my phone while I unpacked our boxes. 
 

when I look at my phone later in the evening I see a text from Simyo saying my phone has been cut off due to a high bill. 
 

when I check my bill it’s 300 euros for the month! I normally pay 11 euros a month! 

I never agreed to paying 15 cents per mb after my data ran out - and the data ran out much quicker than expected so I didn’t have a chance to cut it off. 
 

Please help, this is a bill for multiple years of phone usage.  I have been a loyal customer of Simyo for almost 13 years!