Shocking customer service

It is extremely difficult to have your problem escalated above the call center operative. After ordering a new phone on line I discovered that the courier company appoint my the iStore would only deliver some 12 days after I placed the order even though the deliver conditions offered was the standard 3 to 5 working days. This was unacceptable to me and I wanted to cancel the transaction. All my requests were never answered. I contacted iStore firstly by telephone, then email s and finally by what’s app. I request cancellation but got no reply. I request escalation to management and this appears not to have happened. Just be warned of their shockingly poor customer service