Why does Mr bounderby sent mrs Sparsit back to the town?

Mrs Sparsit had given him infermation that made him look the fool (Louisa was not with another man, she was right there in her father's house). Embarrassed...... Bounderby put her straight back into the coach.

"'Now, ma'am! We shall be happy to hear any little apology you may think proper to offer, for going about the country at express pace, with no other luggage than a Cock-and-a-Bull, ma'am!'

'Sir,' whispered Mrs. Sparsit, 'my nerves are at present too much shaken, and my health is at present too much impaired, in your service, to admit of my doing more than taking refuge in tears.' (Which she did.)

'Well, ma'am,' said Bounderby, 'without making any observation to you that may not be made with propriety to a woman of good family, what I have got to add to that, is that there is something else in which it appears to me you may take refuge, namely, a coach. And the coach in which we came here being at the door, you'll allow me to hand you down to it, and pack you home to the Bank: where the best course for you to pursue, will be to put your feet into the hottest water you can bear, and take a glass of scalding rum and butter after you get into bed.' With these words, Mr. Bounderby extended his right hand to the weeping lady, and escorted her to the conveyance in question, shedding many plaintive sneezes by the way. He soon returned alone."