How can I terminate my subscription after emigration?

dear，

I cancelled my mobile subscription alongside with my internet subscription back then in December 2021 since I left Netherlands permanently. All good now for internet cancellation. However, til now, I still get invoice for my mobile which I don’t use for about 3 months. I tried to call your client service but failed to get through live help as the call was fully in Dutch and right now it simply costs very expensive to call. Is there any way that you guys can help me get this done pls? It’s truly a pain to deal with all these hassle just because somehow in your system my termination wasn’t processed. 

I hereby attach the email I received after I submitted the termination request. It clearly states that I wanted to cancel both my mobile and internet subscription. 

Appreciate any help if you may.

*Admin: titel aangevuld i.v.m. vindbaarheid

*Admin: topic verplaatst naar juiste board