There was this more recent thread talking about this issue, maybe take a gander?
If after this you believe you are being swindled, the next step would be to request proof of execution from T212 (for orders that went through) and compare them to the market’s book. If any discrepancy if found, this may be reported to the regulation agencies.
If you do not place a closing order, because of the displayed spread, keep in mind, as mentioned in this topic already, that all displayed prices are informative only, and may differ quite a bit from the prices you would get in your order.
Placing a limit order would guarantee you execution at your chosen price.
Hope this helps!