UNAUTHORIZED DEBIT ORDERS

On the 23rd November 2018 I spoke to a lady called Nazley Lakay from the abovementioned company and requested a settlement letter so I could settle my account/s with them. She did and I paid, she in turn sent me an email acknowledging receipt of " proof of payment". Things were okay until this year, they started debiting my account again earlier this year, I reversed / disputed the amount with my bank. this month I have been waking up to a series of debit orders from them since the 27th which happens to be my payday!! Can someone please intervene and ask this people to stop messing up with me. I cannot even call them because experience has taught me that that would be fruitless, as you would be sent from pillar to post without a proper explanation or an answer to your question "why". The customer service in that company is non-existent, you just get shunted around by a plethora of idiots who do not even know what theyre doing, in the end , they just drop your call without you getting answers. i need to know why my account is still being debited when i have settled every cent i owe them.