Worse service

the worse exprience ever! I requested a cancellation on my contract on the 27th of feb, was told to call back on the 4th as they unable to get the new and updated letter. I called on the 4th so many times and was told they suspect ***** due to the number of times called. I then called from a landline spoke to a consultant who provided me with the cancellation letter and told me to pay the settlement amount and in march i will pay my last instalment which i said il pay the both amounts. I went to the branch service was excellent and told me to call the accounts department and thereafter the cancellations department and i must send the signed quote with proof of payment. This was done twice on the 7th of march as well on the 13th. No one care to call me or email me back as per my request to get my closure letter instead they kept telling me to call this department and that department. I am sick with the level of service and want a manager to call me if this is not sorted. this will be taken further if no one contacts me!