Asus includes a facility to back up your settings (export) which you can then restore (import) to your new router. With that said, if your router is acting up due to some bad setting then you’ll just put that on the new router too! I’d also argue that in this case you wasted money on a replacement router for no reason. I would recommend that before spending any more money, that you:

1. export your settings
2. factory reset your old router
3. set up your router manually with the old SSID/password/security settings

If you still have issues you can buy the new router and import the settings. If not, you just saved on replacing a perfectly good device.

Good luck🤞

If this is pvc cladding I would recommend low modulus silicone.

Quote from Solseal, experts in sealants, who define this nicely:

“Low modulus sealants adhere to the majority of construction materials and can be used for indoor and outdoor glazing. Low modulus sealants are stretchy, so they can accommodate more movement and offer better adhesion than other alternatives.”

Although they talk specifically about glazing, this advice is based on expansion and contraction of the materials and the ability of the sealant to move with it. It also has a long service life. With that said, the work looks shoddy and I’d call them back. They have a certain duty of care, in regards to your property in my opinion.