Iphone 5 Charger acting up !

I think my charger is broken like under the head of it is like tangled ., ive only had it for 1 year!!
Like when i plug in charger it will stop charging randomly then when i move the charger coord or wat is called .. It will charge again its really anoying cuz it vibrates so much to and i dunno how to turn it off and my phone dont get any power!!!!!