Thanks for all the replies. I indeed have both called and written to IRS (with copy of cancelled checks etc) several times already. What really frustrated me was whenever I called (on the number indicated on the notice), the IRS agents seemed to have no clues. Everytime I would be transfereed among a dozon of agents. All of them could neither find the record I owe sth nor the record of my check payment. There was even one occassion, an agent seemed to suspect my call was hoax. He could not even believe I had received several notices from IRS!!! I guess all those agents could only retrieve Form 1040 related information, but my case was related to Form 8288. Saying this I still don't understand whey they could not find my check payment given it was sent with the IRS provided payment coupon and I wrote my SSN on the check. I have written to local Tax Advocate earlier this week with supporting documentation. But I am not sure whether they can help solve the issue quickly before the matter escalates. (BTW, is Tax Advocate the samething as the IRS Ombudsman?) Do you think is there any other matter I can take? Sometime I really feel it's just wasting time to call or write to IRS. But I am really struggled to find any effective options. Thanks.
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