Lacent pathetic client service

Lancet has given exceptional bad service,my husband did blood tests we never got the bill,only a phone call a month later,they have take an amount from my husband's bank account without notifying us than a month later calls us regarding the outstanding bill we than still didn't get the bill but we still than agreed and made a three month payment arrangement from the 5 Jan 2020 over three months to settle the account spoke to lady called kershnie of which she confirmed that I would be making payment to Lancet and not them take the money directly from us.than they again after making the arrangement go and debt the same amount as last month and two/three days later go and taken the full amount which leaves the account settled however how can they do this? When an arrangement was made does this not mean anything when I questioned Lancet they said it's Christmas and most people don't pay there bills in jan my question how can u generalize i made an arrangement and have not broken it yet.I will not recommended any one to use the services of Lancet in the future as this is a total ******* and utter in consideration and no sense of customer service.This is just not fair and I feel that we were treated with unforessinalism and disrespect.