2 years but but does not want to cancel contract . and *****ing my money

for the past 4 months i am trying to cancel my contract which has expired in october 2020 i have phoned in 5 times and every sales person assures me that it will be cancelled and its marked as urgent . but i still keep getting charged for it every month . this is pathetic service and if nothing is done i am just going to cancel my debit order including the new contract with i took with them .