It very much depends on what main option of the ECC (or ECS?) you are working under as to whether you are entitled to any additional payment. By the sounds of things, the Contractor is advising that what you have issued does not constitute a notification of a Compensation Event.
Whilst you may have submitted several EWN's, this in itself won't (necessarily) mean that you are entitled to any additional payment.
If for instance, you are working under option A, you will have to follow the procedure in core clause 6 in order that a CE is implemented before you are entitled to receive any additional payment as a result of a CE i.e from notification to quotation to implementation.
Whilst you may have submitted several EWN's, this in itself won't (necessarily) mean that you are entitled to any additional payment.
If for instance, you are working under option A, you will have to follow the procedure in core clause 6 in order that a CE is implemented before you are entitled to receive any additional payment as a result of a CE i.e from notification to quotation to implementation.