Ats Infrastructure — ats happy trails

Very bad service from ats happy trails finance team, i always did payment on time and before date. At the same time i send transfer proof to ats team but still they don't have time to update in their system. They always send me new invoice with bank charges & previous outstanding balance.
Even last month they send me very strange email where they mentioned some raheja builder email like they just copy paste email from raheja builder & edited for ats.