Clarification of method of payment

I'm writing regarding clarifying the payments between Proximus and myself.
My customer Number is 617867539.

I already have an agreement with you on the following topic just I don't know if a credit note will be sent for my December and January bill.

Long story short and factbased: In December I got a money collecting statement from Intrum (Proximus referentie 25723785, Intrum 21054261).
Unfortunately I payed it as Intrum gave a wrong information that I didnt pay several minth and I didn't check it in time.

This was 155,54 EUR because I forgot to pay the September bill. I called 3x your rekening call center and it was acknowledged that Proximus college made a mistake and the payment notice was sent to a wrong address.
After figuring out with your college, the 155,45 EUR comes from the following: 48,09 EUR September mobile fee+2,202 EUR technical change of Proximus to change my account nr + 45 EUR fine from Proximus for late payment + 60 EUR schadevergoeding for Intrum.

Based on the agreement with your colleges made this week: I will get back the 48,09 EUR+60 EUR payment (see call center records from this week). Total: 108,09.

I have 2 invoices open, not paid: from December 36,55 EUR and from January 86,82 EUR. Total: 123,37 EUR.

Maybe the easiest is that I get a credit not for full January and I pay only the difference 15,28 EUR as December bill. Please let me know what reference I should write that you can identify te payment.

I’m asking please avoid the methode that you send me the amound back – unless the payment will happen in the next days - as your college said that it never goes automatocally and I have to chase my money several times telling my bank account.

Thanks for your help and understanding.

If you need to reach me, feel free to reach me via my e-mail adress or via my phone, what you have in the system and it is unchanged since years, so cannot cause any problems.

Kind regard,
Olga