This is unusual in that you state the Defense Attorney was not made aware of this change. If Defendant had a negotiated plea and the terms were 10-10-10 and Judge changed on his own to 20-10 then the Defendant could challenge this unilateral change in sentence since it was not what he had agreed to pled guilty too.
If the Defendant was tried and convicted then one would have to look at the transcript to determine if in fact there was a clerical error in recording the Judge's sentence. If the Judge determined that an error in his sentence was made, then he could correct the error. However this type of change is unusual. The Defendant may be able to challenge this drastic change.
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This response is given for informational purposes only.
In Georgia, believe it or not, a judge's oral pronouncement of sentence is not the final word, the WRITTEN pronouncement is. Therefore the direct answer to your question is that, yes, a judge could change the sentence from what is pronounced to what is written. Having said that, I agree with my colleague that this is HIGHLY unusual and the defendant in this scenario would certainly have options, including a motion to correct the sentence and, if this was a negotiated plea, a motion to withdraw the plea. That assumes something I do not know from what you have written, which is that the plea was entered recently enough we are still in the same term of court as we were when the plea was entered.
An experienced attorney is a must here. You need the attorney who assisted the person in their plea, or another attorney to review the situation as soon as possible and provide them with the best options.