How do you block someone from sending you objects?

Two people keep spamming me with objects that freeze my screen, is there any way to block them from sending me anything?

Mute them.

I did, but they're still spamming me. Whenever i login i get spammed immediately.

A) Don't name names here. It's against the rules and can get you banned. Best to edit them out of your post.

B) Copy and save the local chat text that shows all the attempts they're making at giving you those objects, and paste that into an abuse report for harrassment along with a clear description of what's happening.

Since I have the feeling you might be a relatively new resident:

Abuse Report:

Click Help menu in the top, and then go to abuse report

When you say 'spamming me' do you mean they are sending things to your account, or that they're in your vicinity and are sending things *at* your avatar (such as rezzing hundreds of prims around you to try and freeze you)?

If the former, then muting them *should* automatically deny anything they send you. If they're using an object to send the items to you, then you need to mute the owner of that object in order to mute the items it's sending you. (You can do that by checking any offline IMs you may have about being sent the object; they will always say the object owner's name.)

If the problem is the latter, then you need to log into a different area. You can do this before you log in, by checking Edit > Preferences at the top of your viewer screen. Under the General tab you can specify 'Home', 'Last Location' or type in the name of any region you like, to log in there. Try for a quiet water sim. This will give you time to file your abuse report against these people.

Another thought: if, after trying the above, you're still getting spammed, no matter where you log in, it could be something you're wearing, especially if you accepted a random object from a stranger and wore it.

Search your inventory for (worn (include that opening bracket, but don't close it) and note down all the prim attachments you're wearing, including HUDS (the icons will be golden boxes). Then, right-click your avatar and click Detach All. This will remove all prim attachments from your avatar, and also all HUDS on your screen. If the spamming then stops, slowly re-add all the items you noted down, until you find the one that's spamming you. Then delete it.