Funds disappearing

I made an airbnb booking and paid R3130 all inclusive on 31 July and a couple of days later FNB takes R78 off my account using airbnb as a reference. Airbnb knows nothing about the amount. On the 31st of August I bought coffee at Doloros Cafe and R140 went off my account. This morning I wake up and my balance is R140 less because FNB has again taken that amount off my account. These my seem like small amounts to FNB but in this economy every cent counts and I want this money back into my account