Dear Rushab Trivedi,
Answer to question no 1:- Yes. There could be liability under Revese charge mechanism under service tax (section 68(2) of Finance Act 1994.
(Note:- after making payment you can avail as Cenvat Credit to make payment of Excise or service tax)
question 2:- If change of name is resulted in change of pan card & got new RC under excise then Under Rule 10 of CCR you can intimate about tranfer of credits or Just do the amendement in Form A1 and initmate to excise superintendent & commissioner of concerned range.
Note:- (Please share that agreement with your consultant to examine the Place of Provision Rules to chekout the ST liability.
Thanks
Venkat