How do i contact gtm marketing? Please contact GTM Marketing for inquiries about advertising, sponsorship opportunities, or requests for speaking engagements or interviews with GTM’s Founder and CEO Guy Maddalone. General Inquiries: (518) 373-4111 x 7264. Email: [email protected]. What kind of service does gtm business services offer? Business Sales & Service. GTM is an industry leader in payroll services that meet the unique tax, payroll, and human resource needs of today’s growing businesses. Hours of Operation Monday – Friday: 8:30 am – 5 pm ET.What is gtm payroll? GTM is an industry leader in payroll services that meet the unique tax, payroll, and human resource needs of today’s growing businesses. Can’t Talk Now? Current GTM business clients can schedule time with a service team member.