Bend pipe issue in Royal enfield thunderbird. what should i do?

A big hello to all off you out here, i like to share my query with you all guys..... I have thunderbird 2011 model, its done more than 13500 kms, A few days back i noticed a little rusting in the bend pipe which had grown into a circular hole about a size of a new 1 rupee coin, I went to service station and they told me they dont have a new one so for now they have got it welded which they say will be good till I get the new one. I want to know is this common with Thundirbird. And should i keep on using this one or get a new one which costs around 4700+. Please help!!!!!!!

It will be good if you buy a new one, although i would suggest you to go and buy a duplicate one it will be cheaper.