Levi's not answering complaint

Recieved a pair of 501 for my birthday, they ripped within the first 5 months, I did a store replacement after being passed from pillar to post. This pair lasted about 3 months and also ripped, I got hold of customer services, I was asked if they could send a courier to collect them so that they could investigate and replace if need be, this investigation took around 2 to 3 months, and not once did I get an email communicating what was happening, I was always the one that initiated the conversation, what shocked me was the one line answers and the fact that Levi's took upto 3 months to replace them, the replacement pair has now ripped in under 3 months, I have contacted the same person in the customer services department and have not got a reply in 3 weeks, I then emailed customer services and asked them for assistance, got an email saying that it has been escalated and someone will be in touch, nothing has happened, I informed the customer service agent that no one has contacted be, they informed ne that they will escalate it again. Really not happy at all, with the level of service recieved and am currently recieving.