I've trusted for 10 years... What should I do about the missing tax accountant?

[Financial News] "The tax accountant I've trusted for over 10 years has defaulted on taxes and disappeared."
On the 19th, a post with this content was uploaded to the self-employed community 'It Hurts Because I'm a Boss'. A small business owner, Mr. A, in the Gyeonggi area recently discovered through Hometax that 7 million won worth of value-added tax and comprehensive income tax had been defaulted, and was shocked. Although he deposited all the money before the payment deadline, tax accountant Mr. B, who was entrusted with proxy payment, did not pay the amount and suddenly cut off contact.
Mr. B is a friend of Mr. A's older brother's business partner, who started taking charge of tax bookkeeping from the early days of Mr. A's store opening. He intentionally delayed payments and made deliberate defaults, and when delinquency notices or seizure notifications came, he would pay them all at once, according to Mr. A. 
Mr. A said, "The tax accountant always said 'there are circumstances' and hid the fact of default by paying in a lump sum, including penalty taxes," adding, "I didn't even suspect because he was someone I had built trust with for a long time." Although he spent 10 years like this, no bigger problems arose, so he didn't take it seriously.
To inquire about VAT, Mr. A tried to contact him, but all contacts, including KakaoTalk and phone, were cut off. The problem was not only with Mr. A. The office where tax accountant Mr. B worked also said, "Since last week, we have been out of contact with Mr. B." Mr. A asked them to handle the 7 million won since he deposited it into the office account, but the response was, "We are also victims, so either sue Mr. B or do something."
The identified cases of damage so far are diverse, including not only tax defaults but also personal debts and embezzlement of business funds. Some self-employed people are increasingly concerned about the spread of all-round damage, such as economic burdens, in these difficult times.
Experts point out that the 'proxy payment' practice of tax agents is not clearly regulated by law, so even if taxpayers suffer damage, there are limits to legal remedies. An accounting expert lawyer advised, "In a structure where the deposit account and the actual payer are separated, the possibility of fund misuse arises," and "It is necessary for taxpayers to switch to direct payment through Hometax or at least establish a real-time payment confirmation system."

jimnn@fnnews.com Shin Ji-min Reporter