The Central Board of Trustees of EPFO in a meeting on August 21, 2019 approved the proposal to restore the full monthly pension for the EPS members who availed commuted pension. “In a major decision, the Central Board of Trustees (EPFO's apex decision-making body) in a meeting held at Hyderabad on August 21, 2019, approved a proposal to recommend for amendment in EPS-95 for restoration of commuted value of pension to pensioners after 15 years of drawing commutation, which will benefit about 6.3 lakh pensioners.
Read more at:
https://economictimes.indiatimes.com.../74310329.cms?
Thus you have a case for restoring full pension w.e.f 2013 and you are entitled to get arrears too.