sorry to rain on your parade folks, but I believe potential litigation could be the exact reason they don't fit the tie downs in the first place.
example: company I know of sells a wall mounted cupboard, but do not and will not supply mounting screws. According to them, they can’t cater for the myriad of conditions the cupboard may be fixed to, therefore do NOT give any mounting screws as they may be used incorrectly.
If they did supply screws, which ones should they supply?
If the owner uses the wrong ones, as supplied?.... The company gets sued because buyer assumed the supplied screws were for all wall types - of course he screwed it into mortar because it was easier than the masonry and when he put the 50 kilo tellie on the cupboard it fell off...... and so on.
In the end I believe it would be better to get advice from folks around here and use your noodle to work out what's best - litigation means someone/thing was hurt or damaged – this a bad ..... threat of litigation may be seen as a further reason to NOT help, as any advice given and not followed perfectly could be seen as the advisor’s fault for not being clear enough etc etc.
Which brings us full circle - the guys should’ve fitted the suckers themselves and done so in a fit manner
Calling the firm and requesting they return and complete the job is probably the best thing to do - and escalate the call until satisfied...... Personally, I would’ve thought they’d simply adopt the principle when fitting the blinds: "you win on some you lose on some"
On straightforward they walk away knowing all is well and pocket a few extra bikkies..... if there's a more difficult fixing situation, it just gets handled and the added brains-pace and time required means they have spent a wee bit more though ensured their reputation remains first class
man what a sermon! Ok, I am off to machine something - CYA
:D