I'm a dad of 2 wonderful boys. My boys love me more than their mum and my wife never does her mummy duties.. numerous arguments happen due to this.. what should I do?

What is your definition of mummy duties? If housechores, perhaps your wife tired from office work, maybe can pay helper to come. If it' emotional aspects, then try to seek for a counselling (since you mentioned already had arguments,meaning you two need help from the outside). maybe she has different view about having children or perhaps something happened in her past that you don't know. Anyhow, don't give up the love that both of you have. There is no marriage without challenges, so team up with your wife to overcome them.