I've been insured for motor insurance with these guys for the last 10 years or so and they've been good. I've had 2 no-fault damage claims sorted with only minimal hassle. They are a bit bureaucratic, but that goes with the territory.
I insured our house with their household department recently, but they seem considerably more officious. They send out "no reply" emails telling you to phone their office which I dislike, as you never have a record of what's been agreed!
Sometimes conversations are recorded, which in practice is most unfair - if there is a conflict, perhaps a simple misunderstanding you are on a loser!
Of course this happens in the UK too, where I always manage to find an email address (useful for Ryair in particular). Legally you are legally entitled to a copy of any audio recording in the UK, that's probably not so simple elsewhere.
But I've been unable to find an open email address for Linea Directa.
Whilst I've found them OK-ish - if you google them with Trustpilot it's not so good - https://uk.trustpilot.com/review/www.lineadirecta.com, indicates that 83% of folk rate them extremely badly (!), which is a bit of a concern. The reviews are strange - 13% give them a top rating too.
The insurance sector in Spain is 50 years or so behind the UK and standards are very low. All insurance is effectively unregulated, without any meaningful legislation or Ombudsman. So in practice you are on your own if there's a problem - whoever you use.
So I'll probably continue with Linea Directa, simply on the "better the devil you know basis" but just prefer to put everything to them in writing and by email seems the only viable option.
Any email addresses for Linea Directa appreciated please.