I was shocked when MBNA waited for me to have the balance of 7k and then raised the APR from 15.9 to 26.9%.
Thought it was a mistake as why? Never missed a payment etc etc..
Called them - they would not go down, said "we have sent you a letter".
I have never received a letter to be honest - checked with various "governing bodies" and yup, they actually have the right to do whatever they want as APR is VARIABLE.
The are happy to variate up but not down.
After longgggggggggggggg negotiaitons and phone calls EVERY day, they went down to 21.9 but .. they can go up any moment.
AM- I have tried the same as you. None of my creditors would allow lower payments/stretching over longer time etc.
http://anna.blogs.iva.co.uk/