Dear friend,
Since there is no confusion in signing the Transfer application form, your present employer should definitely sign. If your present employer still strongly refuses to sign Form 13, you can apply for withdrawal in Form 19 and 10C by sending the forms to the PF office straight away.
By doing the following:
1) Accepting Scheme Certificate in Form 10C (as it will greatly help you avail pension at a later date).
2) Getting attestation from any gazetted officer or the manager of the bank where you have an account - in place of the employer's attestation.