Totally disgusted with Ironman Guttering /Gutter Solutions

The company installed seamless gutters on my property inAugust last year and I thought they did a good job until we had good summer rains from November. I noticed that one of the downpipe was not draining water at all thereby leading to an overflow which is damaging my garden furniture! I let them know there and then but to date they have not come to fix their mess! Appointments are not fulfilled! Totally disgusted!