Beware that the reception staff at the visa application centre in Bangkok are sending all visitors to an unqualified visa agency instead of directly to the VFS offices as they walk in.
There are plenty of visa touts around and even one offering free Tuk Tuk rides to their offices in the VFS building. Genuine visa operators are regulated by the OISC and are forbidden to tout for business.
Do NOT believe anyone who says they represent us. Our offices are in the building opposite and you are welcome to walk in and see us for help and advice but you will not find us on the pavement touting.