Kalyani Motors — Issue with the service

I own the maruthi ciaz alpha and gave this for service to kalyani motors - horamavu main road, near bbmp office. Kr puram. Bangalore as part of the regular service cadence.

Job card no. Jc19016154
Date of admission 29-feb-2020
Date of delivery 01-mar-2020

They mentioned that they found an issue in my tyre and need to be replaced. Since it is still under warranty, this service center said that they would replace the tyre. However, it has been five months they have not replaced, and i am driving my car using the stepney tyre. I understand due to the covid-19 situation there is a delay but now things are opened and i suppose the services as well. Now the service center is asking me to pay in order to get the new tyre and i have no clue why i should pay where they mentioned earlier that the tyre is under warranty.