Inquiry concerning missing 2nd payment

I ordered my Jolla phone (October 2026 batch, order #29675) last month, with an initial 167.90EUR paid upfront, and another 550EUR due at the end of july.
I have never received a mail to complete this 2nd payment (checked SPAM), or any mail about my 2nd payment being late. I don't like being late with payments, but I don't know where to send my 550EUR and with what message attached. Did anyone here have a similar issue with their 2nd payment?

Kind regards,
Sam