I did not use my sim/phone for 6 months and were wondering if it is possible to get a refund or have the money deducted currently for the future months as i have resumed using the service/sim.
Pm is a prepaid service... if you chose not to use what you've purchased you won't get a refund. Have you been paying on your account for 6 months ?
I don't think you can get a refund. PM is prepaid, meaning you pay in advance for services and it is up to you to use them. You can try contacting a Moderator for a refund if you feel strongly about it, but I don't think that you will be successful. If you know you won't be using your services, I recommend that you turn off Autopay so that you don't pay for months you won't use.
I believe that you would have had a much stronger case asking for a refund if your wish was to stop being a customer and said that you weren't aware that autopay was active. Unfortunately, since you have since resumed using the service, this very much harms that argument. There is a cost to keeping a phone number active.