I use fiver 3 times, my first experience was very positive, I was super happy!
I order two services on the same day, one of the sellers did the best to try to deliver what I was expecting, the second one, didn't response, I tried to contact Fiver but they do not have a contact number support, I tried to send an email, it didn't work neither.
The idea is a great but no every seller has the experience or the same care for the customers. The experience will depend 100% of how lucky you are on finding someone who is there to provide the service that you paid for. Because it's no customer service to complain