Payments team cannot complete thier tasks

Im highly frustrated with the RCS group. I have requested settlement letters for my accounts on the 12th of July 2025, paid them off on the 12th of July emailed the proof of payments to them. To date i have to constantly call the centre to get feedback and am told to email proof of payments to multiple email addresses. When i ask to speak to a manager they are forever in a meeting and do not ever call back. Seems like the payments department does not know what they are doing or they dont work. You cannot even get transferred to them as they dont take calls from their call centres or clients...it is now the 02 of September and i still have not been assisted. Dont know how much longer this is going to go on for.