I have a problem. I bought bitcoin off coinbase and had it sent to my coin.b wallet. It has been 7 days and it still has not arrived. I went onto coin.b and typed in the address I had it sent and it pulled it up. I am trying to retrieve this coin. I think I should be able to broadcast the transaction after I sign it while I'm logged into my coin.b account. I cannot figure out how to put the transaction into hex format so I can broadcast it over the network and have it sent to my ledger hardware wallet.

I need some help  with this, I seemed to have lost some coin here the story.
I bought BTC through coinbase with a credit card. 1000$ worth
I then transferred the btc to my coinb wallet because I purchase on the darknet and its an easy wallet to have setup multisig through.
I bought two things off the darkweb for about 700$ using my coinb wallet
There should be about 300 left in my coinb wallet
I logged in last night and saw that my balance was 0
My receiving BTC adress changed obviously because I had a transaction but I cant think of anything else that could have happen?
If anyone can lead me somewhere to statrt looking or give me some advice I would appreciate it.