Blaming other departments

I'm tired of this nonsense, how long does a company take to find transactions made into their own bank account. Well it been 2 months and the matter is still investigated. My bank has provided me with enough proof that the 24th Nov 17 payments where made into MBD Credit solutions bank account and they say I've used wrong bank account, which the correct bank details where sent to me and to my investigation my bank confirms it's still the same bank details. Is this a way to rob the consumer who might not do follow ups. I don't want any phone calls from the company bt what was promised to me a settlement letter since 3 weeks ago.