The Congress, which is observing November 8 -- which was when Modi announced the note ban measure last year -- as a "Black Day", said it would take out protest rallies under the slogan "Bhugat raha hai desh" (India continues to suffer).
"November 8 is a sad day for the country," Gandhi said.
The day's 'barsi' -- Hindi for death anniversary -- would be marked with candle marches starting at 8 PM across the country to coincide with Modi's announcement. The marches would also be a tribute to those who lost their lives or livelihood because of demonetisation, Congress leaders said.
Gandhi, who chaired a meeting of the party's general secretaries and in-charges which gave the final shape to the plan, attacked Modi, saying he had destroyed the country's economy with the two "torpedoes".
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Singh noted with concern that its "faulty design" had killed jobs and businesses.
He wondered why the government was "celebrating" the anniversary of the note ban, which he described as a "total disaster".
"I don't know what is there to celebrate," he said.
Gandhi said while the economy could withstand the first "torpedo" of the note ban, it could not do so with the GST, and was "shattered" by immense job losses.
The economy, he said, "was in tatters now".
"The prime minster is not able to understand the feeling of the people and the hurt and sadness these two decisions have caused," he told reporters after the two meetings.
Addressing a press conference later, Congress communications in-charge Randeep Surjewala called demonetisation the "century's biggest scam" and said demonstrations would be held in every district and state capital on November 8.
"Sadly, a government drunk with power and blinded by arrogance has the audacity to celebrate the 'surgical strike' on India's economy. People will never pardon the BJP," he said.
Surjewala said it was time for the BJP and Modi to face the nation on promises made and not delivered, and "suffer the punishment in the people's court".
"We will demand exemptions from GST for small traders in cycle, gem, jewellery and textile sectors," he said.
Surjewala said Gandhi noted that both demonetisation and GST were sold to the people by the BJP and the prime minister as a panacea for the poor, ordinary people and small businesses and for fighting black money.
"Demonetisation and GST have turned out to be a double whammy in the life of ordinary people and have crippled or shut down businesses, besides leading to large scale job losses," he quoted Gandhi as saying.
"But where is the black money, since 99 per cent of all the currency has come back? Where is the fake money? Has terrorism stopped," he asked.
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