Extremely unhappy with service

I am very upset about the service Fedex is giving. I am waiting for a parcel that arrived 1.5 weeks ago in CT. No signs of a custom invoice. I submitted all necessary documents, sent 3x my email, phones or sent mails EVERY SINGLE DAY. I import monthly. Use mainly UPS. They manage to ship AND CLEAR a parcel within 3 days. And this over a weekend. Scheduled delivery was last week Friday. My query was filed last week Thursday. Still no invoice. Guys you make it really hard for me to give good service when you can’t clear a parcel within a fair time frame. I’m tired of all the mails and phone calls where people assure me they will come back to me or that my invoice will be sent. Shannon if you need a go ahead for invoicing me for customs then please also contact me- your colleague even asked me 3x if I received a message from Shannon- NEVER. I will happily attend FEDEX next week myself to talk to the CEO as this is simply not working for me. I said multiple times i need my parcel before X-Mas and you waste my time and money. Please don’t reply that we will attend your matter in a short amount of time. My matter should have been resolved by the day before yesterday.