Need help with Play Sim Card; account balance

Hello, my employer gave me Play sim card. I tried to check my account balance and this is what it says: "Biezace saldo niezaplaconych faktur i kwoty wydanej poza abonamentem wynosi -117,45 zl-" What does it mean?

It means you have 117.45 PLN + the sum written in the contract. I have a 30 PLN/month contract, and whatever I spend more ( sms to my friends abroad or phone calls abroad) is added to the 30 PLN.

I see, that was really helpful. :) Thank you!