Complaint Review: LinkedIn

I am dealing with a situation with LinkedIn that I have no idea how to solve. Our company wanted to sponsor a post, which was about a donation we made for homeless kids that don't get gifts for Christmas. We just wanted this promotion for a day only (this isn't the first one we've done, so we're aware of how the end dates work).

Somehow they're saying we didn't put an end date, so since December 24, they have been billing us daily. We now have an expense of almost 7,000 dollars that is going to ruin us. We are a very small business. The premise of "clients need to keep track of their ads, we don't send updates or receipts" seems a bit deceitful to me.

So far Customer Services is telling me that it's our fault, and they will give us 1,000 dollars back only. That's a gesture that although appreciated, still leaves us in a very bad place.

We hire independent contractors, we do good things for people. And considering the current COVID-19 pandemic, we cannot believe this is how they are handling this.