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The 17 TRX deposit might not be credited to your balance but if the transaction went through and is recorded on the blockchain, MetaWin definitely got it. It reached their wallet. I would first get in touch with their support personnel and explain in detail what happened. Ask them to credit those 17 TRX to your account. Alternatively, see if it's possible for you to deposit the difference (23 TRX) and get a total of 40 TRX into your account. It's your mistake but surely fixable.
Yeah is fixable depending on the approach he apply while contacting the support, because even though we have trusted casinos like metawin who will never deny anyone their money as long as is verified and in possession, getting it out require a lot of followup and submission to rules, sometimes you may be ask for documents before you get those money revsed or added up to your balance, so is necessary to get yourself set for whole process, hopefully you get the 17 TRX back any ways since it just a mistake on your part a d you accept it.