Best Practice Agreement advice please

[Unhappygirls]

Advice please -I was working as a self employed Home dog boarder for a third party franchise.
I signed a ‘Best Practice Agreement’, one paragraph states:
”I agree not to solicit or to provide any pet related services directly to any clients introduced to me by the Franchise”.
The Franchise has now, with immediate effect terminated our host/Pet carer role.
There is no time frame mentioned anywhere in the Best Practice Agreement.
Has this any legal standing?
If I contact any of the clients, is this enforceable?
Thanks