Without knowing more detail, it is difficult to know. Who are the claimants and their bulk litigators, if they're using one? When you emailed your AoS and defence, did you receive an auto-response from the CNBC? If not, there is a high likelihood that your email was not processed.
Have you checked your credit file using Experian or any other credit reference agency for default CCJs you may to be aware of?
The procedure, once the claim has been defended is you receive a letter from the CNBC telling you that a copy of your defence as been sent to the claimant. The claimant then is supposed to respond to the defence. Normally that is a letter to you saying that the claimant intends to proceed with the claim. Eventually, you receive an N180 DQ that has to completed and sent back to the CNBC and copied to the claimant (or their solicitor if they're using one). In due course, the claim is transferred to your local court where you receive orders on what to do next and when the hearing date is and when the deadline for submitting your WS.
If you've submitted a defence and not heard anything back for many months, then it is likely that the claim is "stayed" and the claimant would have to apply to the court and pay a fee to request the stay is lifted. You would be copied into the application and could object to the lifting of go the stay and ask the court to strike out the claim.
Som if you want assistance, we need to know all the timelines of each claim, a picture of the Particulars of Claim (PoC) for each claim, who the claimants are and who is representing them, what you actually put in as your defence and any responses from the court or the claimant since.
I really, if there is more than one claim and it is for a different claimant, then a separate thread for each is advised to prevent confusion.