Outstanding Payment

I have had a problem with my wifi account since May 2021 I have submitted several emails and attached payment and called in to their customer service as requested by them. Received emails from their *** advising that this has been sorted. To date nothing has been sorted. Very disappointed at their service as I have been a customer since cellc started. I would really appreciated a Manager to contact me urgently to sort this out. As I have also had an email from their collections department requesting payment.