Reliance Hub Services review: Won't cancel membership

I have paid aed 7500 to reliance hub services for membership, they promised me to cancel it anytime if I have any difficulty. Unfortunately I lost my job and I requested to cancel my membership as I didn't avail any service from them. They agreed to pay by installments from last november 2019. Till today they didn't pay anything. Now none of their contact numbers are reachable.