App problem, billing problem

Hi,

I have problem with two app: Safe24 - Find Family & Friends, Premium and Caller - Call Recorder.

I instal this app and both app ahve free trial period. When i see that this app is for money suddenly i cancel this app.

I did not use this app but I started to receive e-mail from apple where it write that i must to pay the bill, and now I can not install other programs because the problem with the payment method appears to me.

help me please, what to do?

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