As reported by Associated Press today, you may receive a busy signal or be transferred to voicemail instead of talking with an actual person. Senate Majority Leader Mitch McConnell (R) of Kentucky suggests the best way to contact him is online. Older voters may find this is not an option since many do not use the internet or not proficient in finding where to send the email as younger voters. Senator Charles Schumer (D) of New York states calls have averaged 1.5 million a day this week.
Story by the AP is found here: https://www.apnews.com/8ba87a596835416b8471726859529de0/Hello?-People-swamp-Congress-with-calls-in-era-of-Trump