Fast-food chain Subway has deployed a marketing blitz in an apparent bid to challenge allegations that its tuna is fake.

“Keep fishing folks, we’ll keep serving 100% wild-caught tuna,” the sandwich giant said in a tweet after a headline-grabbing lawsuit was filed claiming there isn’t actually any of the fish in its tuna.

The company also said it is offering 15 percent off of one of its footlong tuna subs with the promotional code “ITSREAL,” while another ad touts its “100% tuna mixed with mayo,” CBS News reported.

Subway’s website is also topped with an ad of its tuna sub that says “100% REAL WILD CAUGHT TUNA 100% DELICIOUS.”

Two California women, Karen Dhanowa and Nilima Amin, filed the federal lawsuit on Jan. 21 claiming that “independent testing has repeatedly affirmed, the products are made from anything but tuna” — though did not offer any evidence of that.

They alleged the filling is “made from a mixture of various concoctions that do not constitute tuna, yet have been blended together by defendants to imitate the appearance of tuna.”

But Subway stood by the the quality of its tuna, saying in a statement Thursday that “There simply is no truth to the allegations in the complaint.”

“Subway will vigorously defend itself against these and any other baseless efforts to mischaracterize and tarnish the high-quality products that Subway and its franchisees provide to their customers, in California and around the world, and intends to fight these claims through all available avenues if they are not immediately dismissed,” the statement continued.

Amin and Dhanowa’s lawyer, Alex Brown, said in a statement Friday, “What is Subway selling? We don’t know yet, but we are certain it is not tuna.”

“We’re confident that our clients will prevail when they get their day in court,” Brown’s statement continued.

The women’s lawyers did not immediately return a request for comment on Tuesday.