Is there any company,a that recycles wallets , what assurance do I have that they won't cheat me?
Reputation probably can help, but it only takes one case before everything goes away. Even if you refer to recycling hardware parts, there is nothing stopping them from trying to recover your seeds, unless you watch their process 24/7 I guess.
Isn't it so that if these are really large funds they will say that it is impossible, and then leave the case for 1 year and then recover it by themselves?
That can happen, but the original owner would also realize it. They can definitely say the owner probably stores their seeds somewhere and somebody else accesses them, but I doubt their reputation won't be fine after that. Most scammers probably don't care about it though.