Can bailiffs enter your home when the companys automated payment service wont except pre paid visa cards?

im in trouble i have made payment arrangements with a bailiff company ,due to council tax, tried to make my first payment with a 3v voucher as i dont have a visa card , and guess what they dont except it ,i have used these vouchers loads of times as they can be used anywhere with a visa logo ,had no problems. im getting scared now as they are thretening. please advise on what i should do.