It's pathetic of them and disgusting to con your dad into changing his BB and leaving him w/out any phone
Fir starters, launch a formal complaint with them: TimeTalk Customer Complaints Code
, and when they fail to sort it out, take it to their ADR org. CISAS. Unfortunately it could take over 8 weeks
Is he still paying fees to them? He should write to them cancelling the contract for non-performance and stop paying them.
Can't you just order, and afford, a new line from BT? They will ofter waive connection fees if you take BB from them.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC