An unexpected issue occurred during fund transfer AMAZON ERROR

I did not notice until doing the VAT return that an Amazon payment did not go through for the period Oct 25th - 31st October last year.
I attempted to contact Amazon at the time to say payment was late, with no response. On my statement lists the amount (£133.96) is shown as still outstanding with the error message “An unexpected issue occurred during fund transfer” - please contact seller support.
THis was surprising as there has been no change to my banking details.
When I click on the ‘request payment’ button displaying on this page it just takes me to my ‘current balance’ (this outstanding amount does not appear in my current balance.
The list of payment periods available in the ‘investigate payments’ section in help starts just AFTER this date (November 2017, and the only further action available is to give ‘feedback’ on this page!!
Where do I go to now???