Trending @Capgemini; 13 years in testing SAP tools earning 14LPA. How much underpaid am I and how much as per market I should be getting?

13 years in SAP? what are you even doing in CG? Get some good package and leave. I would say minimum (1.5 x your experience) should be your package

What question you are asking. Instead of asking. Have question yourself that why did u stayed in same company for such a long. You are senior consultant means very good hirerachy than compare to others laterals who entered with having 6 YEO exp with 3 to 4 times exp of CTC like 13*3 or 4.