Hello,
If there is a small spelling mistake in your name on the TCS TAG test admit card, usually they will allow you to attend the test, especially if your photo, registration number and other details match correctly. Since you have already complained, it will not create a big problem. Try to carry a valid photo ID proof (like Aadhaar or PAN) where your correct name is mentioned. Reach the exam centre a little early and inform the officials there if needed.
All the best for your exams!!