Cera Sanitaryware — Cera Flush Tank

I had got the flush tank repaired thru Cera customer service and had called Ravi Sakpal for my issue. The technician came & replaced the ball cock but still the problem persisted & after a month I again called Cera and they sent their technician only to find out that the part was not genuine & he mentioned will escalate the issue but he did not reply to my follow ups stating that everything is fine. The problem again started after 2 months and I called Cera once gain to resolve my problem but they completely refused to replace the part stating that the part is not serviced by Cera technician and they aren't willing to take any responsibility on the same. I feel really cheated. I had called Cera and have a bill too but they are refusing to attend to my issue and asking me to pay for the replacement instead of getting it replaced imm.