How about providing a bit more background if you want some advice?
In the meantime you may want to consider these points:
1. ZZPS (debt collectors) are a third party to any alleged debt you owe ECP and therefore cannot do anything except try to scare you into paying the, by now, exaggerated charge. They will use scary words like "CCJ" and "bailiffs" in the hope that you are low hanging fruit on the gullible tree and their scare tactics will cause you capitulate and pay into the scam.
2. Ignore and never communicate with debt collectors. They are powerless.
3. ECP can take you to court any time up to 6 years after the alleged contravention. They can still "chase" until hell freezes over. They just can't take you to court after 6 years.
So, until you provide us with more detailed information, preferably with evidence of the NtK (both sides) and anything you have said or corresponded with them, there is little else we can do.
