appalling customer service

I have a joint bond from them with my ex partner and i app**** for substitution of debtors reference number *** and as it stands i was told nothing can be done without the other co-applicants signature which i fairly do understand that no even voluntarily repossession can be done without her signature or consent therefore i have closed my bank so that they cannot debit me moving forward reason being all repercussions of having failed debit orders that may result in arrears are only but explained to me yet it is a joint bond, how interesting as i get calls, do the worst it was nice doing business with you guys even though necessary measures will be taken by i that will be of my satisfactory with my name affected badly yet i am the only one informed.