It seems to me that the mortgagees think you are using some delaying tactics, particularly as you agree that you asked them to capitalise arrears and you also agree that you are two months in arrears which your post suggests you cannot immediately pay.(posted 7337 days ago)It will take about 2 months for the process to be fed into the court system at which juncture you will have repossession fees of approx £600 added to your account.
Your best option is to pay back the arrears quickly before it gets to court. In law it is for the debtor to seek out the creditor and pay him/her/them and I fear he problems of the DD will not even enter into it as a defence.