Very poor customer service

If anybody would like to take out a cellphone contract, please do yourself a favor and not look at Cell C's way. Their call center agents do not listen and do not follow through on requests. When the company needs to debit my bank account they do not, sighting that there were no funds, even after I had call the a month before to update my banking details for debit orders. The company is also good at making a person feel like a dishonest fool even if I have been loyal customer since year 2012!!! They also gave me run around with regards to payments which they demanded, in the end I get threatened with disconnections for payment not received. Having paid their bill a week in advance, they still cannot allocate the money paid to them.