Hi Guys, first time poster here.

I have been buying bitcoins for a few months now but only small transactions.
I bought £170 worth earlier (.353 btc)

Copied the electrum receiving address and pasted it into bitbargains send address.
It has been several hours and nothing has come into my account, i checked the receiving address on electrum and the coins are in a watch only wallet. (I dont believe it is mine)

I have no idea how this happened and i am extremely worried. Can anyone advise on what i can do please

i can provide all proof that the coins were purchased by me ( appears on my bank statement, show my account on bitbargain etc.)
i just need to know how to get them from this watch only wallet into my own wallet.