Hi! I am new to Crypto Currency and have recently started using a bitcoin wallet.I made a couple of small transactions and when I kind of got an idea I tried buying a VPN using Bitcoin today. I bought some bitcoins and after the confirmation of receipt I paid to the wallet of the VPN service. I even got a confirmation that bitcoin has  been sent. My bitcoin wallet has been debited but neither the seller has received the funds nor the transaction is appearing in my BitPay transaction history. So I don’t even have a transaction ID.My Bitcoin balance is showing as Zero. I have cleared my cache and have checked the receiver’s address on blockchain but it has not received any funds till now. I really don’t know where my bitcoins have vanished! I really don’t know what to do. Any help would be appreciated.

BTC 0.00

Received 0.015102 BTC
4 hours ago

Sent
0.002974
Sept 26,2019

So no sent transaction but BTC balance showing as Zero!