Worst Customer Service

So just before the 15 November 2019, Elize from Alliance Call Centre Services contacted me with a 30 percent black friday discount. I then paid the settlement amount in full. Sent her proof of payment and everything. Up until this day - have i not yet received my paid up letter, and to top it off people from the place that has apparently handed me over to them is calling me claiming that i still have a balance that needs to be covered. This lady Elize promised that i would receive a paid up letter. I do not understand how in the hell. if i paid it directly into the account. payment reflected immediately - doe it take this damn long - i am so ****ed of with the level of service. and so too understand why people dont pay debt when their accounts has been handed over - because this is what we need to deal with - I am now not even sure if that money has reached my actual creditor. I am not sure how to request a paid up letter from these idiots anymore. This is by far the worst company - should alliance call centre services ever contact any of you with regard to this - DO NOT FALL FOR IT - rather deal with your creditor your self - this is a bunch of bull****! they dont stand for what they promise - and to date i can assume that they ran away with my money !