Continued charges after contract termination 3 months ago

I moved out of Netherlands to India on APRIL 9 2026. 

I submitted the KPN devices on APRIL 9 in the KPN store and they cancelled my KPN Internet connection and KPN Mobile connection. SInce 3 months till now I keep getting invoices and debitting money from my account.

I had a call with help of my friend with KPN customer care and they said to ignore the invoices but the money is getting debitted from my NL account which I kept for other things. 

I submitted the Immigration form also attaching my NL deregister document.

https://www.kpn.com/service/administratie/verhuizen/emigreren/doorgeven

What else you want and why are you charging money unnecessarily. 

Kindly revert my 3 months money back to me ASAP.