Your connection is Exchange feed, no cabinet. You are approx. 1.5km from exchange, so no VDSL. Certainly the 400Kbps upstream is an issue, so internal wiring is most likely a factor. Being on ULL gear will give you better speed than Chorus gear, provided your line is in good shape.
Either get you wiring looked at and master filter installed, or best option of course is fibre.
I'd personally take landlord to tenancy tribunal if they impede your request for fibre. They are there to serve you and should not in any way hinder your ability to have suitable telecommunications service delivered.