[buckminster]

Writing a letter yourself works. In my experience in the UK anyway.

In the past I've had disputes where I've made tens of phone calls to customer support people who cannot solve the problem but pretend they will. Every call is groundhog day.

Now, if the problem isn't solved by the first phone call I write a letter.

A short paragraph (one or two sentences) describing what happened and why it is a problem. A short paragraph describing what I want. Then all the tedious detail. And conclude by restating the problem and what I want. No threats.

It hasn't failed yet.