Airbnb Host with Terrible Customer Service Skills

I stayed at the Crown Point Hotel Tobago (an Airbnb host had an apartment there) back in June 2017. My mother made a few local calls on the landline phone. I had an early check out the next morning. I spoke to the front desk staff the night before to find out what to do with the key. No mention was made of the calls; there was no billing set up. The front desk knew I had an early check out. I wasn’t even thinking about the calls. Months later, I see a nasty message from the host saying that I didn’t pay the phone bill and that the front desk clerk had to pay it. I didn’t intentionally not pay the bill. I was never billed and I wasn’t thinking about it. My contention is this: why didn’t the host just notify me privately? I would have paid the bill then and there. I think the host was being very low down and petty posting his comments on Airbnb as if I had no intentions of paying. I only happened to see the nasty message because I was going to rebook. Never again. Airbnb was difficult to reach to take down the nasty review.