I have been in the dark for a long time

i got an email from customs clearance that was attached with an invoice for my package. i managed to pay on the same day and sent the proof of payment notification to the email i was told to send it back to but i never got a response on whether they've confirmed payment. fast forward my package at my local facility was put on a vehicle for delivery but at the same i had no scheduled delivery date, even today as im writing this i still dont have one(scheduled date). anyways it was out for delivery but the vehicle never arrived i then called customer service and was told it would be delivered the next day, the next day came and it still never arrived nor was i assigned a delivery date and time window as confirmation that it would. i then called fedex customer service and told them my situation i was then told that i hadn't paid for customs even though i sent proof that i did to the given email. i then sent proof of payment to customer service and they said they received it on an email i was given by them to prove it on. my package has been at a local fedex facility for a week without any updates or scheduled delivery date/time. i dont know if its lost or whether there are delays of any kind because it says it is on time or whether the payment wasn't processed by fedex in order for them to return or destroy the package. it has been pending a long time. i have been in the dark for a week. when i call customer service i am assured a delivery date but on the fedex website it continues to pend.