Call centre, calling me non stop for nothing

I have been called 8 times this week, with someone telling me I have to pay my account. Which I have paid already on Monday, after being quarantined for 14 days when someone was a high covid risk close to me. I had phoned in and told them the situation, I was informed that they will make a note on the system. However each one of the 8 I have spoken to this week have said that the system shows nothing. I have told each one that I have paid and they each said they will update it on the system. I have even scheduled a debit order starting Sept 7th. But I still get called. Ive never missed any payment or had any late payment since I opened this account. One would think that they would be a little considerate during this pandemic. I’ve even made sure to make all the payments at PNP stores during the level 5 and 4 lockdown. But this is how they treat their customers. Why dont the system work??? Why is there employees who dont do their work?? Why am I still being called after paying my account at a GAME store???