Vodafone — Network issues

I'm currently studying in the UK (since 2021).I had taken my Vodafone India number with me and activated International Roaming. The number was working fine until May 2022. In June 2022, the network was not getting detected. I tried restarting the cell phone, putting the SIM in a different phone, and some other measures mentioned by Vodafone. However, the SIM was not receiving the network. Hence, I requested for a new SIM in India. I emailed the Vodafone team in June 2022 to issue a new SIM card. They took three months for this process. My mother finally collected the SIM card in September based on NOC and some other documents (proof of identity and address). The store employees mentioned that the SIM card would be activated by the team to whom I made a request to issue a new SIM card. I wrote to the team immediately in mid September to activate the SIM card. They said to send the copy of the NOC and documents proof of my mother once again. I emailed them the same again. It's been more than two weeks since I sent them the documents again and I have been following up continuously (followed up at least twice in these two weeks), but they haven't responded to anything on activating the SIM card. Request you to please help in solving this issue.