What address to use?

I am wondering how to write a letter if I want to say to recipient that I'm asking for response to some other location?

- forum one
- forum two

Another concern: should I mention in a letter to Bank which steps have I taken againts unfair trader?

Tomorrow I'll call Debbie from Consumer Direct (0845 404 0506) to make an inquiry quoting reference YH423 9124.

I will never let myself to be fooled again!