KEBS warned that it would pursue other administrative and judicial actions as deemed necessary.
The bureau's warning is against the Multi-Works and Rights Enforcements Co. Ltd, which it says has been reported for fraudulent activities.
The lawmakers want to establish how the substandard fertiliser passed quality tests and ended up on the market.
All imported second-hand electric motor vehicles must have a minimum battery life of 80 per cent to be eligible for importation into the country.
Following the operation, which reportedly takes place every Tuesday, shop owners alleged heavy-handedness and unfair targeting.
The culprits are said to be engaging in extortion activities with unsuspecting traders across the country.
Kebs in a statement on Wednesday, said they had sampled, re-inspected and tested the edible oils imported by KNTC.