The company initially changed the product weight by widening spaces between triangular chocolate pieces, and it drew criticism from some customers on social media.
Now the bar is speculated to be replaced with a new version, which could weigh 33% more, with a price rise of more than 200%. Mondelēz did not immediately comment on the rumor.
Laura Flynn, Mondelēz’s spokesperson, said: “We are always reviewing our range to make sure we provide great quality Swiss chocolate in formats we know our fans love.
“150g Toblerone is no longer being manufactured and therefore availability of the bar depends on how much stock an individual retailer is carrying.”
She added the 150g bar was “only ever a short term response to cost increases and manufacturing constraints, [and] it was never intended as a long term solution.”
However, Flynn noted 100g and 360g size bars, which were shrunk from the original 400g version at the same time last year, are still be available for £1.63 ($2.14) and £5.49 ($7.21), respectively.
“We’ll also have some exciting new launches later this year,” she said.