Missing dutch number

Hello
I have a question regarding the Dutch mobile number required in the Sim-only payment process. As I am a foreign student, coming from Poland, I do not have a Dutch number yet and it's difficult for me to arrange this number. The payment form doesn't accept my Polish mobile number and I can't pursue my payment without filling this box. Is there anything I could do to process the payment without the Dutch number? Thank you in advance for your help in this matter