Hi Shariff, I'm sorry to hear this.
I too strongly recommend you get your Father to another treatment centre for another opinion.
My husband had a recurrence after he completed radiation and Cisplatin chemo.
His only option then was surgery. He had extensive "salvage" surgery and 31 months later is well.
Wishing you and your Father the best.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!