I've been self-employed for two years and just recently took on a new client 6 months ago. At the outset I told them my rates and they had no qualms. But, after the first or second invoice, the client began making noise about the cost. I am both a content writer and social media manager and frankly, what I charge clients is below the amount I should charge them (but that is an issue for another day).
So, given this mild complaint, we agreed on less hours spent on a specific project. Having followed through on this and had a very positive last meeting with them, they went very quiet after my latest invoice. I chased them now that the invoice is 2 weeks overdue and they said they would pay it in the next 3 days. They also stated that they could no longer continue with my services because I was too expensive
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It is now day 4 and I have received no payment. So, what next? A phone call? Their office is a five minute walk around the corner from my house - I bet they would be mortified if I came in asking about money when customers were around!