I can certainly understand your frustration. Unfortunately, you are not off probation until a judge signs an order to that effect if it is shorter than your original sentence. You could have been transferred to non-reporting probation which is really just a reduced amount of supervision while you serve out the rest of your sentence. Lastly to ease your mind, probation officers are often overworked by how many cases they have to supervise. If your po went on maternity or medical leave, she may not be returning calls. You can actually write a letter documenting your attempts to contact them and send it by fax or certified mail. Since I do not the specific facts of your situation or even which probation office you are dealing with, I cannot be of more help. If you would like to discuss it further, please contact my office.
I tell clients to go to the probation office and sit there until their P.O. comes in. I would skip the phone calls. Probation officer rarely call anyone back, including lawyers.
Do not presume anything at this point. You need to talk with your PO's supervisor & explain that you have had a difficult time reaching your PO and that you need clarification on the status of your probation.