Suzuki Jimny Transmission Problem, Warranty Claim Denied Due to Modifications

The service center advised me to bring my Suzuki Jimny model 2021 in for maintenance because the transmission was buzzing. They said the transmission needed to be replaced as soon as possible. They did, however, explain that the warranty would not cover the repair because it was done on a vehicle that had been altered in some way. Despite the fact that a lift kit was already installed on the vehicle, it had only been installed recently. Furthermore, we did not go to the service center because we were having transmission problems; rather, we went because we were having front suspension problems. This modification has nothing to do with transmission in any way. I respectfully request that the appropriate action be taken in this situation.