Multibit Classic Wallet broken - Ballence unspendable
I had the same problem.
But it is not directly the fault of the wallet.
The wallet sends the transaction with the standard miners fee, not that high.
So miners won't focus on your transaction, because of the low miner fee. This has becoming a more frequent problem since Bitcoin is becoming so big.

But there is a solution!
Try this website ViaBTC

I recommend reading there service statement first.
Than just insert your transaction ID fill in the captcha and press submit.