Extremely bad customer service

This is one company that’s hard to work with, on August 15th I sent them an email informing them that my banking details have changed and issued them with the new details….they didn’t update my details, on the 3rd Feb I sent them another email still they weren’t changed then called in on the 5th September and spoke to Takalani and explained why my account wasn’t paid and requested her to issue me with ADT’s banking details so I can make a deposit in the meantime until my details have been updated, she advised me to wait until Friday the 9th, that’s when the debit orders will be open again, she will give me a call then debit my account, that hasn’t been done and my services have been disconnected, no one from ADT is saying a word, no calls nothing….how hard is it to just change banking details?? Do I realy have to run this much after a company, furthermore they are extremely expensive..I would advise anyone looking to join this company not to, their customer service is the worst and they are expensive…