League Tournament sabotage

You are not getting the turns back, these are gone, period.
As to the behaviour, you got a network error. It could have been caused by various things. Your internet connection could have dropped, your internet provider had an outage, there could have been a loss of peering/connectivity between your ISP and EA servers, an EA server hiccup, and so on. Usually, when this happens, don't just retry it. Wait a bit and then have another go later.