I think I will need a little more info to assist on this.
For example, can you ping your VPN server?
Can anyone else, from another connection, connect to the VPN server?
You need to reinstall your VPN or your account will be expired or might be you are putting wrong password in case you contact to that provider. Further more this might also occurs because of ineffectyive VPN service. I recommend you to choose hidemyass it is Best VPN provider in the industry