Most banks will insist of KYC documents, this has been in vogue and you would have at some point given the details because, without PAN you cannot have transaction or deposits of sizeable amounts.
If you have been holding the account for sometime and have ingored the KYC updating requests from the bank, your account would have been labelled as KYC non-compliant/pending status.
PAN needs to be verified, this may be the reason of the service being unprocessed. At times beyond money transactions, many other online services do not practically happen for various reasons, including lack of staff, end of financial year etc. It may just be an issue of lack of attention or long job queue waiting to be processed
You can call up the bank directly or fill a KYC form and submit it or send it by registered post to the branch.(https://www.sbi.co.in/portal/documents/25328/29531/1380359389917_KYC_CVL_FORM.pdf/f6bc8e9c-d84b-4cf6-ae75-ce47d9d04c01)
You can raise a complaint regarding failure to provide a service, at least in this way, your issue will get logged in and can be referred to if there is a complaint later on against you not providing PAN card details.(https://cms.onlinesbi.com/CMS/)