Game Kenilworth Centre doesn't answer calls

I have been struggling to contact Game Kenilworth since 2nd October. Managed to speak to someone on 2nd October after many attempts but I was meant to call on 3rd October. I have tried since. On 8th October, they answered once, put me through to the department and i was on hold for over 2 minutes, wasting my airtime. I hung up the call and have since not been able to reach them again. I escalated it to their client services, who in turn said they will escalate it. And nothing has changed. How can stores not answer their calls? It isnt an isolated incident. I even sent screenshots of the number of calls i made. Pathetic