.. i checked the blockchain and the transaction to the shapeshift address they gave me was laying unconfirrmed with no confirmations, so i heard i could rebroadcast it too the miners and also use the ViaBtc tranaction accellerator ..
Rebroadcasting your transaction doesn't get your TX confirmed faster.
Rebroadcasting just means you send the transaction to every node connected to yours.
This is done when (some) nodes dropped a transaction out of their mempool (they 'forgot' about it), to get the transaction spread across the network again.
Your transaction was in the mempool of the nodes (it didn't got dropped). It just took some time until a miner decided to include your TX into a block.
.. and the shapeshift address i sent the payment to, looks like as spent my btc to another address on the blockchain..
.. is this normal that the SS address i sent the payment too as forwarded it on to another address where it lies unspent..
This is pretty normal that services 'forward' your deposit. They may payed out another user, or 'reorganized' their coins.
Unfortunately Shapeshift is the only one able to help you :/
.. i opened a support ticked with them and they have stopped replying back to me ..
So they did reply to you (at least once) ? What did they reply? Did they approve your deposit?