I've had my CTB's for 4 years now and just checked the liners...no issues.
'Stich doesn't make the boots (SIDI does) so to get them to repair them is extremely unlikely.
I agree with others that have already posted here.
I would start with the cobbler and proper fit.
Then wearing proper socks, insoles and maybe moleskin.
Cheers and good luck.
'06 R12GSA/Hack & '10 R12GSA
An armed society is a polite society. Manners are good when one may have to back up his acts with his life. Robert A. Heinlein