Lincoln Financial won't provide me with any updates or information regarding extending my claim.

I had back surgery a month ago on T4-T5, pretty much right between my shoulders. Lincoln Financial only approved my STD until my follow up appointment post surgery. They say they don’t get the requested information from the doctors office. The doctors office say they didn’t get a request and so I sit here without getting paid a month after back surgery because they seem to delay making requests, delay replying to requests and seem to ignore my calls requesting for an update. They haven’t denied extending my claim, but also haven’t, and don’t tell me anything. I don’t know what to do. I don’t see the surgeon for another month and can’t go a month without pay. I don’t know what to do!