How to cancel income certificate and apply for a new one?

Hello all, I recently applied for an income certificate through the TN-SEVA website. However, I made a mistake when entering my parent's pension information. Since there was no specific "pension" category, I had to list it under "other" income. I need to obtain an OBC certificate, but my application was rejected because of this error on the income certificate. I've called the TN-SEVAI helpline several times to cancel the incorrect income certificate. They advised me to email the Tahsildar, which I did in December. I haven't received a response. I've also visited both the District Zonal Tahsildar and the VAO, but they each directed me to the other. The collectorate is about an hour's drive from my home. What should I do in this situation? Has anyone else faced a similar problem, and if so, how did you resolve it? Thanks 🙏